[datadog-operator] Update agent version v7.77.0

[gabedos]

What does this PR do?

Updates default latest Agent version to 7.77.0 (based on #2661)

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label
• All commits are signed (see: signing commits)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.49%. Comparing base (fa251de) to head (7ac48b5).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2788      +/-   ##
==========================================
- Coverage   38.80%   38.49%   -0.31%     
==========================================
  Files         309      309              
  Lines       26750    27601     +851     
==========================================
+ Hits        10379    10626     +247     
- Misses      15592    16190     +598     
- Partials      779      785       +6     

Flag	Coverage Δ
unittests	38.49% <ø> (-0.31%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/images/images.go	97.58% <ø> (ø)

... and 9 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fa251de...7ac48b5. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.