refactor(mail): remove unused regon tag form

[Kef131]

Fixes #
b/347352232

Description

Removes unused snippet region tags (<!-- [START form] --> and <!-- [END form] -->) from the index.html webapp pages in the appengine-java8/mailgun and appengine-java8/mailjet sample directories.

Checklist

Testing

• I have tested this change on a live environment and verified it works as intended.
• 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

Compliance & Style

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• 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

Post-Approval Actions

• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request removes the region tag comments ( and ) from the HTML forms in both the Mailgun and Mailjet App Engine Java 8 sample applications. There are no review comments, and I have no feedback to provide.

[angelcaamal]

I didn't find any references, LGTM!

[snippet-bot]

Here is the summary of changes.

You are about to delete 2 region tags.

• appengine-java8/mailgun/src/main/webapp/index.html:19, tag form
• appengine-java8/mailjet/src/main/webapp/index.html:19, tag form

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