fix: the pip without tags should be user-assigned

[nilo19]

What type of PR is this?

/kind bug

What this PR does / why we need it:

1. PIPs without tags should be treated as user-assigned resources. We should not tag user-assigned pip without tags.
2. When the svc changes its IP from one to another, the cached pip can be outdated. Need to refresh the cache when necessary.
3. We should not tag user-assigned pip for DNS labels.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

fix: the pip without tags should be user-assigned
fix: refresh the pip cache when necessary
fix: do not tag user-assigned pip with `kubernetes-dns-label-service: <svcName>`

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[netlify]

✅ Deploy Preview for kubernetes-sigs-cloud-provide-azure canceled.

Name	Link
🔨 Latest commit	c204dbe
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-sigs-cloud-provide-azure/deploys/6464888783db250008f72e82

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nilo19

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [nilo19]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[lzhecheng]

/retest

[nilo19]

/retest

[nilo19]

/retest

[lzhecheng]

/lgtm

[jwtty]

/lgtm

[nilo19]

/cherrypick release-1.27

[k8s-infra-cherrypick-robot]

@nilo19: #3877 failed to apply on top of branch "release-1.27":

Applying: fix: the pip without tags should be user-assigned fix: refresh the pip cache when necessary fix: do not tag user-assigned pip with `kubernetes-dns-label-service: <svcName>`
Using index info to reconstruct a base tree...
M	pkg/provider/azure_loadbalancer.go
M	pkg/provider/azure_loadbalancer_test.go
M	pkg/provider/azure_standard_test.go
M	pkg/provider/azure_utils.go
M	pkg/provider/azure_wrap.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/provider/azure_wrap.go
Auto-merging pkg/provider/azure_utils.go
CONFLICT (content): Merge conflict in pkg/provider/azure_utils.go
Auto-merging pkg/provider/azure_standard_test.go
Auto-merging pkg/provider/azure_loadbalancer_test.go
Auto-merging pkg/provider/azure_loadbalancer.go
CONFLICT (content): Merge conflict in pkg/provider/azure_loadbalancer.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 fix: the pip without tags should be user-assigned fix: refresh the pip cache when necessary fix: do not tag user-assigned pip with `kubernetes-dns-label-service: <svcName>`
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release-1.27

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.