Run 'record screenshots' flow if label is present

[jmartinesp]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Runs 'Record screenshot' GH Actions flow when Run-Screenshots label is present.

Motivation and context

It's an easier way to trigger screenshots from the PR.

Tests

The screenshots were successfully added to this PR.

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/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• 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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bc5c02c) 63.61% compared to head (086a24e) 63.61%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1860   +/-   ##
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  Coverage    63.61%   63.61%           
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  Files         1314     1314           
  Lines        34292    34292           
  Branches      7104     7104           
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  Hits         21816    21816           
  Misses        9228     9228           
  Partials      3248     3248           

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[julioromano]

Does this mean it's going to remove the label as soon as it begins work?
What if we display status with labels too?
It could remove this and add "Screenshot-pending" label while the GH action is ongoing (or maybe it could simply add a comment to the PR with a link to the job?)
And it could add the "Screenshots_recorded" label when finished successfully (and a "Screenshot_error" if something wrong happened?)

[jmartinesp]

You can already see all this in the action list at the bottom of the PR, in the list of actions running/finished: while the screenshots are being recorded, a new "Recording screenshots" job is added, and if it fails it will appear there as failed too AFAICT. If it succeeds, you'll just get a new commit in the PR.