build: validate manifests against 1.28.0

[tillt]

What problem does this PR solve?:
Validates manifests against 1.28.0 using bloodhound

Which issue(s) does this PR fix?:

https://d2iq.atlassian.net/browse/D2IQ-97973

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Checklist

• If the PR adds a version bump, ensure there is no breaking change in Licensing model (or NA).
• If a chart is changed or app configuration is significantly changed, the chart version is correctly incremented (so that apps are not automatically upgraded from a previous version of DKP).

[d2iq-mergebot]

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[coveralls]

Pull Request Test Coverage Report for Build 6173614171

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.532%

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Totals
Change from base Build 6161413759:	0.0%
Covered Lines:	136
Relevant Lines:	171

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💛 - Coveralls

[tillt]

Looking good for 1.28.0:

[...]
2023-09-13 14:24:27 INF  • K8s v1.28.0: parsing resources...
# Warning: 'patchesJson6902' is deprecated. Please use 'patches' instead. Run 'kustomize edit fix' to update your Kustomization automatically.
# Warning: 'patchesJson6902' is deprecated. Please use 'patches' instead. Run 'kustomize edit fix' to update your Kustomization automatically.
# Warning: 'patchesJson6902' is deprecated. Please use 'patches' instead. Run 'kustomize edit fix' to update your Kustomization automatically.
# Warning: 'patchesJson6902' is deprecated. Please use 'patches' instead. Run 'kustomize edit fix' to update your Kustomization automatically.
2023-09-13 14:24:55 INF  ✓ K8s v1.28.0: parsing resources
2023-09-13 14:24:55 INF  • K8s v1.28.0: validating...
2023-09-13 14:25:05 INF  ✓ K8s v1.28.0: validating
2023-09-13 14:25:05 INF PASS