docs(helm): document default Spark UI ingress TLS and annotations

[rahul810050]

This PR documents the default Spark UI ingress TLS and annotations feature

It adds:

• An explanation of Helm-level default TLS and annotation configuration
• Clear precedence rules between Helm and SparkApplication-level settings
• Practical Helm and SparkApplication examples

This makes the default ingress TLS configuration option easier to discover
and use.

[google-oss-prow]

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[google-oss-prow]

Hi @rahul810050. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Arhell]

/ok-to-test