feat(modelarmor): Add samples for updating templates

[harshnasitcrest]

Added Model Armor Snippets:

• Update Template
• Update Template with labels
• Update Template with metadata

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 3 region tags.

• modelarmor/api/ModelArmor.Samples/UpdateTemplate.cs:17, tag modelarmor_update_template
• modelarmor/api/ModelArmor.Samples/UpdateTemplateWithLabels.cs:17, tag modelarmor_update_template_with_labels
• modelarmor/api/ModelArmor.Samples/UpdateTemplateWithMetadata.cs:17, tag modelarmor_update_template_metadata

---

This comment is generated by snippet-bot. If you find problems with this result, please file an issue at: https://github.com/googleapis/repo-automation-bots/issues. To update this comment, add snippet-bot:force-run label or use the checkbox below:

• [ ] Refresh this comment

[amanda-tarafa]

Please fix conflicts before review, thanks.

[harshnasitcrest]

Please fix conflicts before review, thanks.

Done

[amanda-tarafa]

This is failing. Model Armor has been consistently failing for the last couple of weeks on nightly CI. @harshnasitcrest can we focus on fixing the samples/tests that are already merged first, and then go through these PRs one by one? Thanks.

[harshnasitcrest]

@amanda-tarafa Thanks for the review. I've addressed all the comments.

Screenshot of successful tests execution on my local machine:

CC: @Anu4396

[harshnasitcrest]

@amanda-tarafa / @Anu4396 Thanks for the approval! Could you please trigger merge?

Thanks