[release/8.0] Don't assume all S_IFREG files are seekable

[github-actions]

Backport of #120736 to release/8.0

/cc @rzikm

Customer Impact

None, the change is in Debug build only and doesn't affect shipped product.

Regression

No, test failures started after adding/updating AzureLinux3 OS in CI matrix.

Testing

CI passes.

Risk

Low, can be considered test-only change as the changes don't propagate to shipped product.

[wfurt]

Do we need separate approval or was it covered by the one for 9.0/10.10? And should this be release/8.0 r release/8.0-staging?

[agocke]

Tell mode, we're good to go when tests pass.

[rzikm]

/ba-g Test failures around X509Certificates are unrelated

[rzikm]

Do we need separate approval or was it covered by the one for 9.0/10.10? And should this be release/8.0 r release/8.0-staging?

It should be release/8.0-staging (facepalm), and it got automerged so I noticed too late

@ViktorHofer what should we do in this case?

[jozkee]

what should we do in this case?

@rzikm nothing, staging is there just to let authors merge their own changes without having to wait for folks with admin permissions.

Keep targeting staging in the future since that will test your change with all other changes in the release. Of course, this does not apply for 10.0 servicing.