Build/Test Tools: Update stale step comment lists in reusable workflow files

[khokansardar]

The step comment lists (the # - Step description. comment blocks at the top of workflow jobs) in two reusable workflow files are out of sync with their actual steps.

In .github/workflows/reusable-phpstan-static-analysis-v1.yml, the comment list was not updated when the workflow was refactored in [62440] to remove the Get last Monday's date step and add Set up Node.js, Install npm dependencies, and Build WordPress steps. Three steps are missing from the comment list and the order of Logs debug information and Installs Composer dependencies is also incorrect.

In .github/workflows/reusable-coding-standards-php.yml, the Get last Monday's date step — which is needed to generate the cache key for the PHPCS scan cache — is present in the actual job steps but absent from the step comment list.

The step comment lists (the # - Step description. comment blocks at the top of workflow jobs) in two reusable workflow files were out of sync with their actual steps.

In reusable-phpstan-static-analysis-v1.yml, the comment list was not updated when the workflow was refactored to remove the Get last Monday's date step and add Set up Node.js, Install npm dependencies, and Build WordPress steps. Three steps were missing from the comment list and the order of two others was incorrect.

In reusable-coding-standards-php.yml, the Get last Monday's date step is present in the job but was absent from the step comment list.

Trac ticket: https://core.trac.wordpress.org/ticket/65391

## Use of AI Tools
N/A