fix: Ignore diff with schema

[leoluz]

Fix #9071

• fix: managed fields diff using proper schema from cluster cache

Note on DCO:

If the DCO action in the integration test fails, one or more of your commits are not signed off. Please click on the Details link next to the DCO action for instructions on how to resolve this.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• Optional. My organization is added to USERS.md.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).

[codecov]

Codecov Report

Merging #9170 (ac6b1af) into master (7005453) will decrease coverage by 0.05%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##           master    #9170      +/-   ##
==========================================
- Coverage   45.86%   45.81%   -0.06%     
==========================================
  Files         221      222       +1     
  Lines       26309    26377      +68     
==========================================
+ Hits        12067    12084      +17     
- Misses      12586    12631      +45     
- Partials     1656     1662       +6     

Impacted Files	Coverage Δ
controller/appcontroller.go	52.07% <0.00%> (-0.21%)	⬇️
util/argo/managedfields/parser.go	100.00% <ø> (ø)
util/argo/managedfields/managed_fields.go	42.04% <36.61%> (-32.96%)	⬇️
controller/state.go	73.64% <50.00%> (-0.26%)	⬇️
controller/sync.go	56.84% <50.00%> (-0.12%)	⬇️
util/argo/diff/diff.go	52.20% <60.00%> (-0.07%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7005453...ac6b1af. Read the comment docs.

[alexmt]

LGTM. Please don't forget to update gitops engine version before merging.