add check for unresolved variables

[gaurav-gogia]

• adds a check for $ in the beginning of user_data_base64 to account for unresolved variables
• works as a workaround for base64 decode error caused due to incorrect string
• fixes issue Failed to run prepared query error in opa/engine.go #709

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #770 (83533de) into master (9ac1667) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #770   +/-   ##
=======================================
  Coverage   73.78%   73.78%           
=======================================
  Files         110      110           
  Lines        3285     3285           
=======================================
  Hits         2424     2424           
  Misses        677      677           
  Partials      184      184           

[kanchwala-yusuf]

This issue needs to be fixed from terrascan side, closing this PR. We can reopen if required!