Skip needed_rules controls in rule-identifiers reference validation

[Arden97]

Description:

• Modified the static-checks rule-identifiers test to exclude rules tagged with the special needed_rules STIG control
  identifier from reference validation. The test now:
  • Collects and stores STIG ID text values during datastream parsing in a new rule_stigid_text dictionary
  • Captures both the reference href and text content for all rule references
  • Filters out rules with stigid_text == needed_rules before validating that rules contain their expected policy reference URLs

Rationale:

• The 'needed_rules' identifier is a special STIG control category used for supporting rules that are required for compliance infrastructure but don't correspond to actual numbered security requirements.
• These rules serve operational purposes (dependencies, prerequisites, etc.) rather than implementing specific STIG requirement IDs.
• Fixes Various RHEL 8 and RHEL 9 rules are missing stigref references ComplianceAsCode/content#14359

Review hints:

• use atex to reserve a tf machine and run static-checks/rule-identifiers test