Hide first run dialog

[simonhong]

Temporarily hide till we have numbers from new welcome flow.
If welcome flow do better than FR dialog, we'll delete FR dialog.

Resolves brave/brave-browser#27225

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally:
  • npm run test -- brave_browser_tests, npm run test -- brave_unit_tests wiki
  • npm run lint, npm run presubmit wiki, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

1. Launch Brave with clean profile
2. Check first run dialog is not launched

[github-actions]

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cc: @simonhong

[kjozwiak]

Reproduced the original behaviour on Win 11 x64 using the following build(s):

Brave | 1.48.38 Chromium: 108.0.5359.99 (Official Build) nightly (64-bit) 
--- | ---
Revision | 410951fc34bb4b2cbf182231f9f779efaafaf682-refs/branch-heads/5359_71@{#9}
OS | Windows 11 Version 22H2 (Build 22621.963)

Using the STR/Cases outlined via #16282 (comment), reproduced the original behaviour as per the following:

Verification PASSED on Win 11 x64 using the following build(s):

Brave | 1.48.57 Chromium: 108.0.5359.128 (Official Build) nightly (64-bit)
--- | ---
Revision | 1cd27afdb8e5d057070c0961e04c490d2aca1aa0-refs/branch-heads/5359@{#1185}
OS | Windows 11 Version 22H2 (Build 22621.963)

Using the STR/Cases outlined via #16282 (comment), verified that the default browser modal wasn't being displayed when Brave is initially installed.

---

Reproduced the original behaviour on macOS 13.0.1 Ventura x64 using the following build(s):

Brave | 1.48.38 Chromium: 108.0.5359.99 (Official Build) nightly (x86_64)
--- | ---
Revision | 410951fc34bb4b2cbf182231f9f779efaafaf682-refs/branch-heads/5359_71@{#9}
OS | macOS Version 13.0.1 (Build 22A400)

Using the STR/Cases outlined via #16282 (comment), reproduced the original behaviour as per the following:

Verification PASSED on macOS 13.0.1 Ventura x64 using the following build(s):

Brave | 1.48.57 Chromium: 108.0.5359.128 (Official Build) nightly (x86_64)
--- | ---
Revision | 1cd27afdb8e5d057070c0961e04c490d2aca1aa0-refs/branch-heads/5359@{#1185}
OS | macOS Version 13.0.1 (Build 22A400)

Using the STR/Cases outlined via #16282 (comment), verified that the default browser modal wasn't being displayed when Brave is initially installed.