chore(cloudrun): Cleanup deprecated sample Cloud Run Filesystem

[grayside]

The Cloud Run Filesystem sample app is no longer in use.

Description

Fixes #

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Checklist

• [ ] I have followed Sample Format Guide
• [ ] pom.xml parent set to latest shared-configuration
• [ ] Appropriate changes to README are included in PR
• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [ ] Tests pass: mvn clean verify required
• [ ] Lint passes: mvn -P lint checkstyle:check required
• [ ] Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [ ] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 4 region tags.

- [run/filesystem/Dockerfile:15](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/a2bce77b002d9c1fd279108b5253538f0fc19f69/run/filesystem/Dockerfile#L15), tag `cloudrun_fs_dockerfile` - [run/filesystem/gcsfuse.Dockerfile:15](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/a2bce77b002d9c1fd279108b5253538f0fc19f69/run/filesystem/gcsfuse.Dockerfile#L15), tag `cloudrun_fuse_dockerfile` - [run/filesystem/gcsfuse_run.sh:15](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/a2bce77b002d9c1fd279108b5253538f0fc19f69/run/filesystem/gcsfuse_run.sh#L15), tag `cloudrun_fuse_script` - [run/filesystem/run.sh:15](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/a2bce77b002d9c1fd279108b5253538f0fc19f69/run/filesystem/run.sh#L15), tag `cloudrun_fs_script`

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