update pr testing workflow with stronger checks

[johnsonaj]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

• Stronger regex checks for valid characters when passing test patterns
• remove eval when running tctest
• Append _ split character to test discovery so test cases are more specific

Relations

Closes #0000

References

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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[jar-b]

LGTM 🚀