DOC-3231 Clarify projectKey parameter wording in README

[kevin-hinz]

Summary

Standardizes the language used to describe the projectKey parameter across all tools in the README.

• Replaces "omitted when SONARQUBE_PROJECT_KEY is configured" with "(Ignored when SONARQUBE_PROJECT_KEY is defined)" for consistency
• Adds the missing ignored note to search_security_hotspots and list_pull_requests, which were previously not indicating that SONARQUBE_PROJECT_KEY supersedes the parameter

[sonar-review-alpha]

Summary

This PR standardizes the wording used to describe how the SONARQUBE_PROJECT_KEY environment variable overrides the projectKey parameter across all tools in the README.

All instances of "(omitted when SONARQUBE_PROJECT_KEY is configured)" are changed to "(Ignored when SONARQUBE_PROJECT_KEY is defined)" for consistency. The change also fills gaps in two tools (search_security_hotspots and list_pull_requests) that were missing this note entirely—these now correctly document the environment variable override behavior.

What reviewers should know

Scope: Changes are confined to README documentation only—no code changes.

Two types of changes to verify:

1. Wording updates (most tools): "omitted" → "Ignored", "is configured" → "is defined"—verify language is now consistent throughout
2. Additions (2 tools): search_security_hotspots and list_pull_requests now document the environment variable override—check that these additions accurately reflect actual tool behavior

Key files: Single file modified (README.md) across lines 903–1072 in the parameter documentation sections.

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[hashicorp-vault-sonar-prod]

DOC-3231

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues
0 New dependency risks

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

See analysis details on SonarQube Cloud

[nquinquenel]

Thanks!