Run assign fixed issues and first time contributor label tasks for PRs from forks

[talldan]

Description

Fixes #17324

Github actions for a while had a limitation that certain actions could not be taken on PRs from forks as the access token provided in the action was read only.

As kindly pointed out #17324 (comment), github has now introduced a new pull_request_target event that receives a full read/write access token. This action is run against the base of the PR so has no security issues from commits that the PR introduces.

In this PR I've:

• Split out a separate 'firstTimeContributorLabel' task that runs on the pull_request_target event (when a pull request is opened) and labels PRs from first time contributors
• Removed the labelling we already did when first time contributor PRs are merged as that's now redundant. The existing task has been renamed from 'firstTimeContributor' to 'firstTimeContributorAccountLink' (it posts a message reminding users to link their github account to their WordPress org profile). Seems sensible to keep this the same.
• Also run the 'assignFixedIssues' task on pull_request_target, previously it didn't run on PRs from forks.

I think we may also want to consider adding a welcome message for first time contributors, but I've focused on getting things working to start with.

How has this been tested?

Unit tests

Types of changes

Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[github-actions]

Size Change: 0 B

Total Size: 1.19 MB

ℹ️ View Unchanged

Filename	Size	Change
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build/annotations/index.js	3.77 kB	0 B
build/api-fetch/index.js	3.42 kB	0 B
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build/blob/index.js	664 B	0 B
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build/block-directory/style-rtl.css	943 B	0 B
build/block-directory/style.css	942 B	0 B
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build/block-library/editor.css	8.91 kB	0 B
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build/block-library/theme-rtl.css	792 B	0 B
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build/data-controls/index.js	821 B	0 B
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build/date/index.js	11.2 kB	0 B
build/deprecated/index.js	768 B	0 B
build/dom-ready/index.js	571 B	0 B
build/dom/index.js	4.46 kB	0 B
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build/edit-navigation/style-rtl.css	881 B	0 B
build/edit-navigation/style.css	885 B	0 B
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build/edit-widgets/style.css	3.16 kB	0 B
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build/editor/index.js	42.5 kB	0 B
build/editor/style-rtl.css	3.85 kB	0 B
build/editor/style.css	3.85 kB	0 B
build/element/index.js	4.62 kB	0 B
build/escape-html/index.js	735 B	0 B
build/format-library/index.js	6.86 kB	0 B
build/format-library/style-rtl.css	547 B	0 B
build/format-library/style.css	548 B	0 B
build/hooks/index.js	2.16 kB	0 B
build/html-entities/index.js	623 B	0 B
build/i18n/index.js	3.57 kB	0 B
build/is-shallow-equal/index.js	713 B	0 B
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build/keycodes/index.js	1.94 kB	0 B
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build/list-reusable-blocks/style-rtl.css	476 B	0 B
build/list-reusable-blocks/style.css	476 B	0 B
build/media-utils/index.js	5.31 kB	0 B
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build/primitives/index.js	1.43 kB	0 B
build/priority-queue/index.js	790 B	0 B
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build/reusable-blocks/index.js	3.05 kB	0 B
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build/warning/index.js	1.14 kB	0 B
build/wordcount/index.js	1.22 kB	0 B

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[talldan]

I'm not completely convinced this works. I would've expected to see a pull_request_target event come through:
https://github.com/WordPress/gutenberg/actions?query=event%3Apull_request_target

but there are none. Could be something to merge and try?

[kevin940726]

LGTM!

Could be something to merge and try?

Yeah, maybe just try this and see what's wrong?

[talldan]

Lets give it a go!

[talldan]

Cool, an event came through here on my next PR:
https://github.com/WordPress/gutenberg/actions?query=event%3Apull_request_target