CSPL-3972 Addressing TODOs

[kasiakoziol]

Description

It addresses TODOs from #1550 and defines helm charts for IngestorCluster and enhances existing helm chart for IndexerCluster.

Key Changes

• Handling missing values and defaults
• Updating conf files only with changed values, not all of them at the same time
• Helm charts
• Tests

Testing and Verification

Automated and manual tests.

Related Issues

Jira: https://splunk.atlassian.net/browse/CSPL-3972

PR Checklist

• Code changes adhere to the project's coding standards.
• Relevant unit and integration tests are included.
• Documentation has been updated accordingly.
• All tests pass locally.
• The PR description follows the project's guidelines.

[coveralls]

Pull Request Test Coverage Report for Build 18184292699

Details

• 241 of 263 (91.63%) changed or added relevant lines in 4 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.07%) to 86.164%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/splunk/client/enterprise.go	7	9	77.78%
pkg/splunk/enterprise/ingestorcluster.go	125	133	93.98%
pkg/splunk/enterprise/indexercluster.go	108	120	90.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/splunk/enterprise/indexercluster.go	3	74.59%

Totals
Change from base Build 17610018166:	0.07%
Covered Lines:	11234
Relevant Lines:	13038

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💛 - Coveralls