Fix examples

[peter-mcclonski]

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Purpose of this PR

Updates examples to be runnable out of the box with the latest pre-release version.

Proposed changes:

• Fixes the default value of sparkJobNamespaces to [""] rather than [], bringing the actual behavior in line with that documented in the user guide.
• Updates the service account in the example SparkApplications to reflect the default created service account name, allowing them to run out of the box.
• Updates the spark worker image used in the example SparkApplications to the official Apache 3.5.0 image, as the prior image was unreachable.

Change Category

Indicate the type of change by marking the applicable boxes:

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

In preparation for the first release, we should ensure that all new-user documentation and resources are usable and accessible.

Checklist

Before submitting your PR, please review the following:

• I have conducted a self-review of my own code.
• I have updated documentation accordingly.
• I have added tests that prove my changes are effective or that my feature works.
• Existing unit tests pass locally with my changes.

Additional Notes

Resolves #2009 , #2008

[vara-bonthu]

Thanks for the PR @peter-mcclonski 👍🏼

[vara-bonthu]

@peter-mcclonski Please sign your commits. Check DCO check

[peter-mcclonski]

@peter-mcclonski Please sign your commits. Check DCO check

Yup, working it right now. Had some silliness with Windows vs WSL

[peter-mcclonski]

@peter-mcclonski Please sign your commits. Check DCO check

Should be all set for you now.

[vara-bonthu]

/lgtm

[google-oss-prow]

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This pull-request has been approved by: peter-mcclonski, vara-bonthu

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