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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