Stop polling issues when creating new team response

[nknguyenhc]

Summary:

Fixes #1282

Changes Made:

• In IssueService, created a new boolean field isCreatingTeamResponse.
• Change the value of the field when creating team response.
• Use the field to stop polling issue

Note: I did not change the order of API calls in view of #1264

Proposed Commit Message:

Before this, team response might be created
at right the moment the issue is being polled.
This causes the error message to pops up,
as request to update label has been processed,
but request to create comment has not.

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Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 58.50%. Comparing base (5e7ed48) to head (203b78d).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
src/app/core/services/issue.service.ts	14.28%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1283      +/-   ##
==========================================
+ Coverage   54.82%   58.50%   +3.67%     
==========================================
  Files         105      104       -1     
  Lines        2858     2574     -284     
  Branches      503      290     -213     
==========================================
- Hits         1567     1506      -61     
+ Misses       1030     1017      -13     
+ Partials      261       51     -210     

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[Arif-Khalid]

Excellent implementation of a simple flag to track status of team response updates.
LGTM!