Update tier workflows for release-0.9

[mguetta1]

Summary

Update all tier workflow files to test against release-0.9 instead of release-0.7.

Files to Update

• .github/workflows/releases-tier0.yml
• .github/workflows/releases-tier1.yml
• .github/workflows/releases-tier2.yml

Changes Needed in Each File

1. Update branch triggers

Replace release-0.7 with release-0.9 in:
```yaml
on:
push:
branches:
- release-0.9 # was: release-0.7
pull_request:
branches:
- release-0.9 # was: release-0.7
```

2. Update job names

Change job name from `test-tierX-release07` to `test-tierX-release09`

Example: `test-tier0-release07` → `test-tier0-release09`

3. Update parameters

```yaml
with:
tag: release-0.9 # was: release-0.7
operator_tag: v0.9.0-beta.1 # was: (old operator tag)
api_hub_tests_ref: "release-0.9" # was: "release-0.7"
```

Configuration

• New version: release-0.9
• Old version: release-0.7
• Operator tag: `v0.9.0-beta.1`

Example PR

See #334 for reference (updated release-0.6 → release-0.8)