fix: Ensure to delete cookies when switching from single to chunks and vica versa

[frederikprijck]

When we reintroduced cookie chunking in #1975, we did not take into account cleaning up existing cookies:

• when we switch to chunked cookies, we want to remove the non chunked cookie
• when we switch back to non chunked cookies, we want to remove the chunked cookies.

Ideally, we would only ever have chunked cookies (with a single chunk when the cookie does not exceed the treshold) as that would simplify things alot.

However, with this PR I am addressing the issue reported in #2009

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.77%. Comparing base (0d7bfc4) to head (a717b5c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2013      +/-   ##
==========================================
+ Coverage   74.68%   74.77%   +0.08%     
==========================================
  Files          21       21              
  Lines        1853     1859       +6     
  Branches      286      288       +2     
==========================================
+ Hits         1384     1390       +6     
  Misses        462      462              
  Partials        7        7              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.