fix(devops): kill blobber grpc process if it exists

[cnlangzi]

Changes

Fixes

• fixed :31501 : bind: address already in use on github action integration_tests

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

[codecov-commenter]

Codecov Report

Merging #689 (ea77c48) into staging (5c41263) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           staging     #689   +/-   ##
========================================
  Coverage    22.02%   22.02%           
========================================
  Files           69       69           
  Lines         7933     7933           
========================================
  Hits          1747     1747           
  Misses        5924     5924           
  Partials       262      262           

Flag	Coverage Δ
Unit-Tests	22.02% <ø> (ø)

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