fix: Added missing platform folder ignore to 2 workflows (#1788)

## Description

Added missing `platform` folder ignore to 2 workflows

## Type of Change

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [ ] Update to CI Environment or utlities (Non-module effecting
changes)
- [x] Azure Verified Module updates:
- [ ] Bugfix containing backwards compatible bug fixes, and I have NOT
bumped the MAJOR or MINOR version in `version.json`:
- [ ] Someone has opened a bug report issue, and I have included "Closes
#{bug_report_issue_number}" in the PR description.
- [ ] The bug was found by the module author, and no one has opened an
issue to report it yet.
- [ ] Feature update backwards compatible feature updates, and I have
bumped the MINOR version in `version.json`.
- [ ] Breaking changes and I have bumped the MAJOR version in
`version.json`.
  - [ ] Update to documentation

.github/workflows/avm.res.network.application-gateway.yml

@@ -30,6 +30,7 @@ on:
       - ".github/workflows/avm.res.network.application-gateway.yml"
       - "avm/res/network/application-gateway/**"
       - "avm/utilities/pipelines/**"
+      - "!avm/utilities/pipelines/platform/**"
       - "!*/**/README.md"
 
 env:

.github/workflows/avm.res.sql.managed-instance.yml

@@ -29,6 +29,7 @@ on:
       - ".github/workflows/avm.res.sql.managed-instance.yml"
       - "avm/res/sql/managed-instance/**"
       - "avm/utilities/pipelines/**"
+      - "!avm/utilities/pipelines/platform/**"
       - "!*/**/README.md"
 
 env: