Handle Flink 2 job server tag in releases and SDK snapshot

[Abacn]

Please add a meaningful description for your change here

Apparently the tag added locally and used for push uses different configuration

Locally it's tagged via containerImageName(tag), but for push it uses tags config in BeamDockerPlugin.

Tested locally using ./gradlew :runners:flink:2.0:job-server-container:dockerPush -Pdocker-repository-root=gcr.io/apache-beam-testing/beam_portability -Pdocker-tag-list=testtag,latest,

gcr.io/apache-beam-testing/beam_portability/beam_flink_job_server

has -flink2.0 suffixed tags added.

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Summary of Changes

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This pull request refines the Docker image tagging strategy within the Beam build system. It introduces a flexible mechanism to append version-specific suffixes to Docker image tags, which is then applied to correctly identify Flink 2 job server containers. This ensures that images for different Flink versions are distinctly and consistently tagged, improving clarity and management in release and snapshot processes.

Highlights

• Enhanced Docker Tagging: Introduced a tagSuffix property in the BeamDockerPlugin to allow appending a consistent suffix to all generated Docker image tags.
• Flink 2 Job Server Tagging: Implemented the tagSuffix mechanism for Flink 2 job server container images, ensuring that version-specific suffixes (e.g., -flink2) are correctly and consistently applied to all relevant tags during releases and SDK snapshots.

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[Abacn]

R: @Amar3tto @damccorm

Just FYI for 2.72.0rc5 I've added "2.72.0rc5-flink2.0" tag manually

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