Problems with integration new analyzer by SARIF report

[feeelin]

Describe the bug
When integrating a new analyzer report format for this project, we encountered problems:

1. Severity for all warnings is considered Unspecified
   This happens both when parsing the SARIF report (adding Severity is marked as TODO there) and when manually parsing and passing Severity to an object of the Report class.
2. The link to documentation (helpUri, help fields) is not pulled from the SARIF report.

CodeChecker version
6.24

To Reproduce
Steps to reproduce the behaviour:

1. Pass the report to the SARIF parser
2. Get intermediate report
3. Save the report via CodeChecker store ....

Expected behaviour
Analyzer warnings have Severity and when you view them, help text from SARIF is displayed in place of the checker documentation.

Desktop (please complete the following information)

• OS: Ubuntu 22.04.3
• Browser: Chrome
• Version: 128.0.6613.138

Additional context
The integration of the new analyzer is done in the report-converter from SARIF format as universal for all static analyzers. Below I attach a couple of screenshots of the behavior that is described in this Issue.