[rocm-libraries] ROCm/rocm-libraries#8558 (commit ccfa08b)

[CK][CI] Retry git network ops to survive transient DNS blips
 (#8558)
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## Motivation

CI builds intermittently fail on transient git DNS blips (e.g. `Could
notresolve host: github.com`). These surface as an untyped `exit code
1`, which the existing node/transient-fault retry doesn't catch — so a
momentary glitch fails the whole build.

## Technical Details

Added `gitNetRetry(label, body)` (3 attempts, 15s backoff) and wrapped
every github.com-touching git step: ref-repo clone/update, `checkout
scm`, and the hipTensor clone. All are idempotent on retry. Docker pulls
are left to the existing `pullImage()` path.

## Test Plan

- Mapped the failing build's `git remote update` DNS error to a
now-wrapped call.
- Confirmed no existing code retries git host-resolution failures.

## Test Result

Groovy shared-library — not locally executable; needs a pipeline run to
fully validate. Check CI.

## Submission Checklist

- [ ] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.