Chart: Add unit tests for default backend & topology spread constraints.

[Gacko]

What this PR does / why we need it:

Adds unit tests for the default backend and topology spread constraints.

Also removes trailing whitespaces introduced in #11197.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[netlify]

✅ Deploy Preview for kubernetes-ingress-nginx canceled.

Name	Link
🔨 Latest commit	b8ec2cc
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-ingress-nginx/deploys/66105816a3e5d900085258e5

[Gacko]

/triage accepted
/kind cleanup
/priority backlog

[Gacko]

/cherry-pick release-1.10

[k8s-infra-cherrypick-robot]

@Gacko: once the present PR merges, I will cherry-pick it on top of release-1.10 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.10

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.

[Gacko]

/cc @strongjz

[strongjz]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gacko, strongjz

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:

• charts/ingress-nginx/OWNERS [Gacko,strongjz]

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

[k8s-infra-cherrypick-robot]

@Gacko: #11218 failed to apply on top of branch "release-1.10":

Applying: Chart: Add unit tests for default backend & topology spread constraints.
Using index info to reconstruct a base tree...
M	charts/ingress-nginx/templates/default-backend-deployment.yaml
Falling back to patching base and 3-way merge...
Auto-merging charts/ingress-nginx/templates/default-backend-deployment.yaml
CONFLICT (content): Merge conflict in charts/ingress-nginx/templates/default-backend-deployment.yaml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Chart: Add unit tests for default backend & topology spread constraints.
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:

/cherry-pick release-1.10

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.