Update java requirement: we now need Java 21

[asnare]

Changes

This PR updates the Java requirements for the CLI from 11 to 21. The most recent builds of Morpheus switched from Java 11 to 21, so this is now a requirement.

Linked issues

Context: databrickslabs/morpheus#952 (private)

Functionality

• updated relevant user documentation
• modified existing command: databricks labs lakebridge install-transpile

Tests

• updated integration tests

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 67.16%. Comparing base (e969dff) to head (2b75cd7).

Files with missing lines	Patch %	Lines
...atabricks/labs/lakebridge/transpiler/installers.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2507   +/-   ##
=======================================
  Coverage   67.16%   67.16%           
=======================================
  Files         107      107           
  Lines       10027    10027           
  Branches     1083     1083           
=======================================
  Hits         6735     6735           
  Misses       3092     3092           
  Partials      200      200           

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[github-actions]

✅ 183/183 passed, 8 flaky, 2 skipped, 56m37s total

Flaky tests:

• 🤪 test_installs_and_runs_local_bladebridge (10.999s)
• 🤪 test_installs_and_runs_pypi_bladebridge (23.236s)
• 🤪 test_transpiles_informatica_to_sparksql_non_interactive[False] (25.524s)
• 🤪 test_transpiles_informatica_to_sparksql_non_interactive[True] (26.192s)
• 🤪 test_transpiles_informatica_to_sparksql (26.542s)
• 🤪 test_transpile_teradata_sql (26.646s)
• 🤪 test_transpile_teradata_sql_non_interactive[False] (25.768s)
• 🤪 test_transpile_teradata_sql_non_interactive[True] (26.398s)

_{Running from acceptance #4830}