Bug 1800542 - Bug fix for part 4

[gbrownmozilla]

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• 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
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[gbrownmozilla]

This is to fix the problem seen in https://firefoxci.taskcluster-artifacts.net/UES29ipWRQOZ1BM5LiAbDQ/0/public/logs/live_backing.log:

[task 2022-11-17T18:38:12.277Z]   File "/builds/worker/checkouts/vcs/taskcluster/ac_taskgraph/loader/build_config.py", line 128, in loader
[task 2022-11-17T18:38:12.277Z]     if "dependencies-src" in affected_components:
[task 2022-11-17T18:38:12.277Z] TypeError: argument of type 'object' is not iterable

If the get_affected_components() branch hasn't been run, then affected_components is already ALL_COMPONENTS (which would complicate the check for dependencies-src).

[hneiva]

Rubber stamp'd

[JohanLorenzo]

Thank you guys for this hotfix! I'm sorry I missed that in the fix I provided. I'm glad the decision task is back to green on the main branch!

Follows up:

• Bug 1800542 - Refactor Dependencies into a plugin using composite build #148
• Bug 1800542 - part 2: Fix decision task by pointing to the new Gecko.… #171
• Bug 1800542 - part 3: Fix condition on head_ref to rebuild all comp… #173