tls: make Server.getTicketKeys throw instead of assert

[nektro]

assert is for invariants and prints a message about the condition being a bug in Node.js if false.
throw ERR_INVALID_ARG_VALUE for publicly facing validation.
this brings it into sync with the validation done in configSecureContext.

[nodejs-github-bot]

Review requested:

• @nodejs/crypto
• @nodejs/net

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.23%. Comparing base (a436f7b) to head (8b57b5e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #58365      +/-   ##
==========================================
- Coverage   90.24%   90.23%   -0.01%     
==========================================
  Files         633      633              
  Lines      186859   186860       +1     
  Branches    36685    36687       +2     
==========================================
- Hits       168622   168620       -2     
- Misses      11036    11040       +4     
+ Partials     7201     7200       -1     

Files with missing lines	Coverage Δ
lib/internal/tls/wrap.js	94.39% <100.00%> (+<0.01%)	⬆️

... and 27 files with indirect coverage changes

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