For #5583 - Adds telemetry for download notification

[gabrielluong]

This fixes #5583. We pick up the Facts emitted from the Downloads copmonent that are documented in https://github.com/mozilla-mobile/android-components/tree/master/components/feature/downloads#facts.

Action	Item	Description
RESUME	notification	The user resumes a download.
PAUSE	notification	The user pauses a download.
CANCEL	notification	The user cancels a download.
TRY_AGAIN	notification	The user taps on try again when a download fails.
OPEN	notification	The user opens a downloaded file.

It also adds 2 telemetry probes into DownloadNotificationBottomSheetDialog to track in-app notification usage:

• User opens a downloaded file by tapping on the in-app notification link
• User taps on retry when a download fails on the in-app notification link

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Pull Request checklist

• Quality: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)
• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features

After merge

• Milestone: Make sure issues finished by this pull request are added to the milestone of the version currently in development.

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[gabrielluong]

Request for data collection review form

All questions are mandatory. You must receive review from a data steward peer on your responses to these questions before shipping new data collection.

1. What questions will you answer with this data?

• How often the user interact with the download notifications and status

2. Why does Mozilla need to answer these questions? Are there benefits for users? Do we need this information to address product or business requirements?

• This will help us prioritize bugs and features related to downloads (depending on how popular the feature is)

3. What alternative methods did you consider to answer these questions? Why were they not sufficient?

• No current alternative methods.

4. Can current instrumentation answer these questions?

• Currently there are no events to track this.

5. List all proposed measurements and indicate the category of data collection for each measurement, using the Firefox data collection categories on the found on the Mozilla wiki.

• All data is Category 2.

6. How long will this data be collected?

• Until 03/01/2020

7. What populations will you measure?

• All release, beta, and nightly users with telemetry enabled.

8. Please provide a general description of how you will analyze this data.

• Glean / Amplitude

9. Where do you intend to share the results of your analysis?

• Only on Glean, Amplitude and with mobile teams.

[codecov-io]

Codecov Report

Merging #6554 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #6554      +/-   ##
============================================
- Coverage     16.77%   16.73%   -0.05%     
  Complexity      349      349              
============================================
  Files           271      271              
  Lines         10650    10681      +31     
  Branches       1483     1492       +9     
============================================
  Hits           1787     1787              
- Misses         8716     8747      +31     
  Partials        147      147

Impacted Files	Coverage Δ	Complexity Δ
...la/fenix/components/metrics/GleanMetricsService.kt	7.35% <0%> (-0.37%)	3 <0> (ø)
...va/org/mozilla/fenix/components/metrics/Metrics.kt	20.58% <0%> (-1.39%)	0 <0> (ø)
...downloads/DownloadNotificationBottomSheetDialog.kt	0% <0%> (ø)	0 <0> (ø)	⬇️

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[boek]

Data Review Form (to be filled by Data Stewards)

1. Is there or will there be documentation that describes the schema for the ultimate data set in a public, complete, and accurate way?
   Yes, metrics.yaml and metrics.md

2. Is there a control mechanism that allows the user to turn the data collection on and off?
   Yes, under data controls

3. If the request is for permanent data collection, is there someone who will monitor the data over time?
   Has expiry

4. Using the category system of data types on the Mozilla wiki, what collection type of data do the requested measurements fall under?
   Type 2

5. Is the data collection request for default-on or default-off?
   Default on

6. Does the instrumentation include the addition of any new identifiers (whether anonymous or otherwise; e.g., username, random IDs, etc. See the appendix for more details)?
   No

7. Is the data collection covered by the existing Firefox privacy notice?
   Yes

8. Does there need to be a check-in in the future to determine whether to renew the data?
   Will check-in at expiry

9. Does the data collection use a third-party collection tool?
   No