[backend] Add retry on imap connexion

[RomuDeuxfois]

Proposed changes

• Try to improv Imap connexion

Related issues

• In some cases, IMAP store of sent message can fail #1028

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 32.21%. Comparing base (29ec77a) to head (c6ed6bc).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
...o/openbas/injectors/email/service/ImapService.java	0.00%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1497      +/-   ##
============================================
- Coverage     32.24%   32.21%   -0.03%     
  Complexity     1451     1451              
============================================
  Files           532      532              
  Lines         13798    13809      +11     
  Branches        821      821              
============================================
  Hits           4449     4449              
- Misses         9143     9154      +11     
  Partials        206      206              

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