chore: add missing scripts to sentinel-api-service (#9522)

## Explanation

`sentinel-api-service` was missing `lint:tsconfigs` and
`lint:tsconfigs:fix` after #8384 was merged.

## References

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Are there other links that reviewers should consult to understand these
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Are there client or consumer pull requests to adopt any breaking
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* Fixes #12345
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## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/processes/updating-changelogs.md)
- [ ] I've introduced [breaking
changes](https://github.com/MetaMask/core/tree/main/docs/processes/breaking-changes.md)
in this PR and have prepared draft pull requests for clients and
consumer packages to resolve them

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Only `package.json` script entries change; no runtime or API behavior
is affected.
> 
> **Overview**
> Adds **`lint:tsconfigs`** and **`lint:tsconfigs:fix`** to
`@metamask/sentinel-api-service`’s `package.json`, using the same shared
`../../scripts/lint-tsconfigs/lint-tsconfigs.mts` entry points as other
packages.
> 
> This brings the package in line with the monorepo convention
introduced in #8384 so tsconfig lint can run locally and in CI for this
package too.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
7ad22af. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: Mrtenz

packages/sentinel-api-service/package.json

@@ -44,6 +44,8 @@
     "build:docs": "typedoc",
     "changelog:update": "../../scripts/update-changelog.sh @metamask/sentinel-api-service",
     "changelog:validate": "../../scripts/validate-changelog.sh @metamask/sentinel-api-service",
+    "lint:tsconfigs": "tsx ../../scripts/lint-tsconfigs/lint-tsconfigs.mts",
+    "lint:tsconfigs:fix": "tsx ../../scripts/lint-tsconfigs/lint-tsconfigs.mts --fix",
     "messenger-action-types:check": "tsx ../../packages/messenger-cli/src/cli.ts --formatter oxfmt --check",
     "messenger-action-types:generate": "tsx ../../packages/messenger-cli/src/cli.ts --formatter oxfmt --generate",
     "since-latest-release": "../../scripts/since-latest-release.sh",