DEVEX-723: fix shell syntax errors in jira-ticket-check

[pdodgen-revparts]

Summary

Fixes shell syntax errors that occur when PR title/body contains special characters like parentheses.

Problem:
The workflow was directly interpolating ${{ github.event.pull_request.body }} into shell scripts, which caused syntax errors when the PR body contained shell metacharacters like (, ), $, backticks, etc.

Example error:

/home/runner/work/_temp/694052c8-278e-4e47-9605-3fbb9600951c.sh: line 21: syntax error near unexpected token `('

Solution:
Use env: blocks to pass PR body, title, and other user-supplied content as environment variables instead of direct interpolation. This safely handles special characters.

Before:

run: |
  PR_BODY=$(printf '%s' "${{ github.event.pull_request.body }}")

After:

env:
  PR_BODY: ${{ github.event.pull_request.body }}
run: |
  # PR_BODY is now safely available as an environment variable

Test plan

• Create a test PR with parentheses in the title like fix(something): description
• Verify the jira-ticket-check workflow passes without syntax errors