Update CS10 builder image to Bazel 7.5.0 + Java 21

[vamsikrishna-siddu]

What this PR does / why we need it:
Updates KUBEVIRT_CS10_BUILDER_VERSION to 2605290816-89fad9a940 across all CS10 presubmit jobs (pull-kubevirt-verify-rpms-cs10, pull-kubevirt-build-cs10, pull-kubevirt-build-cs10-arm64, pull-kubevirt-build-cs10-s390x).
This new builder image includes Bazel 7.5.0 and Java 21, which are required by the rules_img migration in kubevirt/kubevirt#17598.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

Partially Addresses: kubevirt/kubevirt#17113

Special notes for your reviewer:

• This is a prerequisite for Migrate all container images from rules_oci to rules_img kubevirt#17598 (rules_oci → rules_img migration).
• Both this PR and Migrate all container images from rules_oci to rules_img kubevirt#17598 can be merged in any order. All CS10 builder jobs (pull-kubevirt-build-cs10, pull-kubevirt-build-cs10-arm64, pull-kubevirt-build-cs10-s390x, pull-kubevirt-verify-rpms-cs10) are optional: true, so with only one PR merged the CS10 lanes will fail but won't block any other PRs. Once both are merged, CS10 lanes will pass again.

Checklist

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• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
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• Community: Announcement to kubevirt-dev was considered

Release note:

     None.

[gemini-code-assist]

Code Review

This pull request updates the KUBEVIRT_CS10_BUILDER_VERSION environment variable to 2605290816-89fad9a940 across multiple presubmit jobs in the CI configuration. There are no review comments, and I have no feedback to provide.

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[kubevirt-bot]

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[0xFelix]

/lgtm

[vamsikrishna-siddu]

/cc @dhiller