Remove ./ before sending test path to runner generation with hack-fast-builds flag

[corwinsheahan-wf]

Motivation

The --hack-fast-builds functionality doesn't gracefully handle test paths which start with ./.

Changes

Check the path and remove the preceding ./ if it exists before sending it to the runner generation.

[aviary3-wk]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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Questions or Comments? Reach out on Slack: #support-infosec.

[willdrach-wk]

lgtm

[corwinsheahan-wf]

QA +1

• Travis failure is a known issue that will be fixed in dart_dev v3
• Can now use the hack-fast-builds flag with ./ and non-./ prefixed test paths
  Merging into master.
  @Workiva/release-management-p