🌱 Avoid using deprecated client.Patch method

[Karthik-K-N]

What this PR does / why we need it:
This PR contains the changes remove usage of deprecated client.Patch method

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 # Part of 12695

[Karthik-K-N]

Only need to update the methods in managedfields_test.go file like

cluster-api/internal/util/ssa/managedfields_test.go

Line 363 in fe23f8f

g.Expect(env.Client.Create(ctx, createCM, client.FieldOwner(tt.createManager))).To(Succeed())

.

Is it recommended to convert structured to unstructured before using Apply?

[sivchari]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: b1d11a3bf2cea81671f8a2716fa3788030d64d68

[sbueringer]

/test pull-cluster-api-e2e-main
/lgtm
/approve

Thank you very much!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

Unrelated flakes, will be fixed separately

/override pull-cluster-api-e2e-main

[k8s-ci-robot]

@sbueringer: Overrode contexts on behalf of sbueringer: pull-cluster-api-e2e-main

In response to this:

Unrelated flakes, will be fixed separately

/override pull-cluster-api-e2e-main

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