fix: add advanced projects to populate experience dropdown (#791)

[dharini-sharma]

Summary [required]

The data/projects.json file previously contained no projects with an "Advanced" level. Because the frontend dropdown dynamically populates based on the dataset, "Advanced" was missing as a selectable option. This PR adds two advanced projects to the dataset, which resolves the bug and successfully populates the dropdown.

Related Issue [required]

Closes #791

Type of Change [required]

• Bug fix — resolves a broken behaviour
• Feature — adds new functionality
• Data — adds new projects to data/projects.json
• Documentation — updates docs, README, or code comments only
• Style — CSS or visual changes only, no logic change
• Refactor — restructures code without changing behaviour
• Test — adds or updates tests

What Was Changed [required]

File	Change made
data/projects.json	Added ID 33 (Network Anomaly Detection) and ID 34 (CI/CD Pipeline)
starter_code/adv_ml_anomaly.py	Added starter code file referenced in JSON
starter_code/devops_pipeline.yml	Added starter code file referenced in JSON
CHANGELOG.md	Added note about advanced projects under Unreleased

How to Test This PR [required]

1. Clone this branch: git checkout fix/issue-791-advanced-dropdown
2. Start the local development server (Note: use python src/app.py as app.py has been moved).
3. Open http://127.0.0.1:5000 in the browser.
4. Scroll to the Find Project form and verify "Advanced" is now available in the Experience Level dropdown.

Test Results [required]

41 passed, 11 failed out of 52 tests

Note: The 11 failures are due to NameErrors (missing imports like _URL_RE and load_all_career_roadmaps) currently existing on the upstream main branch.

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