SNOW-2107822 : Remove Snyk workflow files

[sfc-gh-hpathak]

Overview

SNOW-XXXXX

Pre-review self checklist

• PR branch is updated with all the changes from master branch
• The code is correctly formatted (run mvn -P check-style validate)
• New public API is not unnecessary exposed (run mvn verify and inspect target/japicmp/japicmp.html)
• The pull request name is prefixed with SNOW-XXXX:
• Code is in compliance with internal logging requirements

External contributors - please answer these questions before submitting a pull request. Thanks!

1. What GitHub issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Issue: #NNNN

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
   • I am adding new logging messages
   • I am modifying authorization mechanisms
   • I am adding new credentials
   • I am modifying OCSP code
   • I am adding a new dependency or upgrading an existing one
   • I am adding new public/protected component not marked with @SnowflakeJdbcInternalApi (note that public/protected methods/fields in classes marked with this annotation are already internal)

3. Please describe how your code solves the related issue.

   Please write a short description of how your code change solves the related issue.

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Additional Information

Removing Snyk workflows as these are deprecated / not working. We now have
managed Snyk scans that also open JIRA issues. This also removes internal
repo dependencies.

[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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1 out of 2 committers have signed the CLA.
✅ (sfc-gh-hpathak)[https://github.com/sfc-gh-hpathak]
❌ @harsh Pathak
Harsh Pathak seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[snowflake-security-bot]

Snowflake Security Review

Security grade: A — Passed ✅

This PR was classified as LOW risk by the automated pre-screen (openai-gpt-5-mini: LOW, claude-haiku-4-5: LOW).

No full security review will be run. If you believe this is incorrect, add a commit to re-trigger the workflow.