Update docs after #165258 (#165716)

Follow up from #165258 
Removes references to the deleted Infra-Ticket-Queue.md, and mentions of
the Infra Ticket Queue Github project.
Not sure if we should keep the issue template?

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

.github/ISSUE_TEMPLATE/6_infrastructure.yml

@@ -1,3 +1,4 @@
+# TODO(matan): Update to reflect the new infra world, https://github.com/flutter/flutter/issues/165814
 name: The CI infrastructure used by Flutter has a problem
 description: |
   As a contributor, you want to file an issue about the build/test/release
@@ -23,11 +24,10 @@ body:
       description: |
         Is this a bug, feature request or Infra Task?
 
-        If you have a bug and you believe the issue is a blocker please add the P0 label and
-        set the project to 'Infra Ticket Queue.'
+        If you have a bug and you believe the issue is a blocker please add the `P0` label.
 
         If this is a devicelab feature such as a package update or a device is down please
-        add the 'device-lab' label to the created issue and set the project to 'Infra Ticket Queue.'
+        add the `infra: device lab` label to the created issue.
       options:
         - bug
         - feature request