fix: [PIDM-1733] Handle lower case fiscal codes

[gioelemella]

List of Changes

• updated fiscal code regex to match both upper and lower case
• force fiscal codes to upper case before tokenization
• avoid Pattern.compile() for each invocation
• refactor code to reduce duplication

Motivation and Context

PIDM-1733
Allow receipt generation for biz events with lower case fiscal codes
Improve performance by precompiling Pattern

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[github-actions]

Comment this PR with update_code to update openapi.json and format the code. Consider to use pre-commit to format the code.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
90.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud