NO-ISSUE: Require E2E on osac-test-infra and code owners (step B)

[eliorerz]

Step B of moving osac-test-infra pull requests to the native flow of osac (step A, 271,
is applied and 612 is merged): the full-install suites become required through the E2E
check written by the OSAC CI app (integration 4966101), a path listed in CODEOWNERS
needs approval from its owner team, ci-duty may bypass the review requirements as in
osac, and the merge queue waits up to 180 minutes for slow full-install runs.

Why now: with only CI and jira-reference required, a code pull request that CodeRabbit
approves is put in the merge queue and can merge before any suite has run (seen on the
canary pull request 615, which I took out of the queue). The docs-only canary (614) showed the
app writes E2E on this repository, so requiring it is safe.

Apply on merge (Terraform). After it, the code canary needs the suites to pass.

[coderabbitai]

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