Update the strings for unsupported calls

[bmarty]

Content

Iterate on the strings used to renders legacy call in:

• notification
• room list last message
• timeline

Motivation and context

Closes #3853

Screenshots / GIFs

Element.X.unsupported.call.mp4

Tests

• Alice uses Element X
• Bob is using Element Web
• Bob starts a voice call using Element Web
• Alice should see all the unsupported strings regarding the incoming call as per the video above.

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[bmarty]

The case is CallNotifyContent should probably be moved here as well, but this is a bit out of scope of this PR.

[github-actions]

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[jmartinesp]

Just to confirm, is the text used for the timeline item the right one? The issue mentions using:

Unsupported call. The new Element X app is needed to join this call.

But the included text seems to be different. Also, just having "Unsupported call" as the notification messages seems weird to me, there's plenty of space to explain why it's not supported.

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.97%. Comparing base (7574fef) to head (70dbcde).
Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s/messagesummary/DefaultMessageSummaryFormatter.kt	0.00%	1 Missing ⚠️
...tformatter/impl/DefaultRoomLastMessageFormatter.kt	0.00%	1 Missing ⚠️
...entformatter/impl/DefaultTimelineEventFormatter.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3857      +/-   ##
===========================================
- Coverage    82.97%   82.97%   -0.01%     
===========================================
  Files         1783     1783              
  Lines        44985    44982       -3     
  Branches      5296     5296              
===========================================
- Hits         37328    37325       -3     
+ Misses        5806     5805       -1     
- Partials      1851     1852       +1     

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[bmarty]

Just to confirm, is the text used for the timeline item the right one? The issue mentions using:

Unsupported call. The new Element X app is needed to join this call.

But the included text seems to be different. Also, just having "Unsupported call" as the notification messages seems weird to me, there's plenty of space to explain why it's not supported.

This wording is in the section Legacy side. This PR is for Element X, so it would be strange to ask the user to use Element X in the Element X app (I do not blame you, I am also confused sometimes with all this legacy / x things)

About the notification content, I have done what's been done on iOS in https://github.com/element-hq/element-x-ios/pull/3502/files

[jmartinesp]

LGTM then, thanks.