CHEF-25758 - standardize - Removing SLA from README

[nandanhegde73]

This pull request removes the oft-misleading Chef SLA text from the README.md file. This action is being taken as part of the 2025 Repo Standardization Initiative. As Progress Chef makes a best effort to respond to issues and pull requests in a timely manner, and prioritizes bugfixes and security updates on a customer-driven basis (which may span repos, or have no repo footprint at all), we no longer support the concept of a Service Level Agreement (SLA) on a repository-centric basis. For further details, see Repo SLA Removal FAQ.

[github-actions[bot]]

Simplecov Report

Covered	Threshold
98.51%	90%

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[sonarqube-for-infrastructure-prod[bot]]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud