Update static reachability docs: LA maturity and language-specific levelss

What does this MR do and why?

This MR title captures both key changes:

  1. Updates the overall maturity level to Limited Availability (LA)
  2. Introduces language-specific maturity levels (Beta for Python/JS/TS, Experimental for Java)

References

Static Reachability - Java Support: Documentation (#547078 - closed) • Orin Naaman, Joel Patterson

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