🐛 SSA: ignore diff of other managers

[sbueringer]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #6879

[sbueringer]

cc @fabriziopandini @chrischdi

[sbueringer]

/retest

[vincepri]

/lgtm

[chrischdi]

Change makes sense to me.

/lgtm

Should we add a proper failing test at internal/controllers/topology/cluster/structuredmerge/serversidepathhelper_test.go TestServerSideApply:

1. Create obj using topology mgr + ssa
2. modify object using other manager (to get a change in cache so the diff would occur in managedFields when creating the patchhelper)
3. create patchhelper using output obj of 1.
4. assert that there would be no changes?

[sbueringer]

Change makes sense to me.

/lgtm

Should we add a proper failing test at internal/controllers/topology/cluster/structuredmerge/serversidepathhelper_test.go TestServerSideApply:

1. Create obj using topology mgr + ssa
2. modify object using other manager (to get a change in cache so the diff would occur in managedFields when creating the patchhelper)
3. create patchhelper using output obj of 1.
4. assert that there would be no changes?

Integrated it one of the tests we already have

[sbueringer]

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.2

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[fabriziopandini]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #6888

In response to this:

/cherry-pick release-1.2

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.