Add template tests to Nightly

[theopnv]

Purpose of this PR

Add template tests to ABV. (Follow up of #1708)

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Testing status

Yamato: (Select your branch):
You can see templates tests were added to the nightly: https://yamato.prd.cds.internal.unity3d.com/jobs/902-Graphics/tree/yamato%252Ftemplates%252Fadd-test-to-abv/.yamato%252F_abv.yml%2523all_project_ci_nightly_trunk/3472377/job/pipeline:

Green run: https://yamato.prd.cds.internal.unity3d.com/jobs/902-Graphics/tree/yamato%252Ftemplates%252Fadd-test-to-abv/.yamato%252F_templates.yml%2523all_template_ci_trunk/3469391/job

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Notes to reviewers

I had to update the changelogs and package.json files because of errors when running upm-ci: example on an old run: https://yamato.prd.cds.internal.unity3d.com/jobs/902-Graphics/tree/yamato%252Ftemplates%252Fadd-test-to-abv/.yamato%252F_templates.yml%2523test_hdrp_template_windows_trunk/3431242/job

[sophiaaar]

i have 2 questions:

1. will this be stable enough to run in ABV (as opposed to only nightly)?
2. could problems arise when the version bumps after each push to master?

[theopnv]

1. Let me add these to the nightly instead. In a few weeks we can reconsider. We can even leave them in the nightly, now that we can benefit from Evergreen and in an effort to reduce the load on ABV.
2. I'm not sure to completely understand. Are you referring to validation problems like there https://docs.unity3d.com/Packages/com.unity.package-validation-suite@0.15/manual/lifecycle_validation_error.html? In that case we would have to fix the issue on a case-by-case basis. Or other kinds of problems?

[sophiaaar]

1. great 👍
2. i think im just worried that things could get out of sync with the template, but im sure its fine, and having it nightly will mean that if something does happen, it won't block anyone