docs(cockpit): deprecate managed alerts routes

[scaleway-bot]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.28%. Comparing base (5bf53e0) to head (1294ad4).
⚠️ Report is 852 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (1294ad4). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (1294ad4)
	2	1

Additional details and impacted files

@@ Coverage Diff @@ ## master #5061 +/- ## =========================================== - Coverage 75.45% 56.28% -19.18%  =========================================== Files 202 307 +105 Lines 44323 78263 +33940 =========================================== + Hits 33444 44050 +10606  - Misses 9653 32786 +23133  - Partials 1226 1427 +201 

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