chore(monitoring): split to test utils

[Itay-Tsabary-Starkware]

Stack:

• chore(monitoring): use constants #1864
• chore(monitoring): format imports #1863
• chore(monitoring): add 'is_alive' client #1862
• chore(monitoring): split to test utils #1861 ⬅
• fix(monitoring): typos #1860

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

[reviewable-StarkWare]

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.54%. Comparing base (46c08be) to head (36ee09c).

Additional details and impacted files

@@                Coverage Diff                 @@
##           spr/main/365230ca    #1861   +/-   ##
==================================================
  Coverage              54.54%   54.54%           
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  Files                      2        2           
  Lines                     55       55           
  Branches                  55       55           
==================================================
  Hits                      30       30           
  Misses                    25       25           

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