Fix: Reserved character Issue in Certs

[BLasan]

Purpose

• fixes: Publishing api with certificates which contain "&" symbol generates an error api-manager#2101

[RakhithaRR]

Verify the test failures before merging

[BLasan]

Verify the test failures before merging

Tests are continuously failing from the previous PRs

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 34.72%. Comparing base (8562c1f) to head (cbe028b).
Report is 24 commits behind head on master.

❗ Current head cbe028b differs from pull request most recent head 88673c6. Consider uploading reports for the commit 88673c6 to get more accurate results

Files	Patch %	Lines
.../carbon/apimgt/impl/utils/CertificateMgtUtils.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12134      +/-   ##
============================================
+ Coverage     26.10%   34.72%   +8.62%     
+ Complexity     9876     2344    -7532     
============================================
  Files          1860     1840      -20     
  Lines        137868   136334    -1534     
  Branches      20012    19724     -288     
============================================
+ Hits          35990    47346   +11356     
+ Misses        96663    82712   -13951     
- Partials       5215     6276    +1061     

Flag	Coverage Δ
integration_tests	27.07% <0.00%> (+0.96%)	⬆️
unit_tests	20.47% <0.00%> (?)

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