Revert "[2.x] Extracts demo configuration setup into a java tool, adds support for Bundled JDK for this tool and updates DEVELOPER_GUIDE.md"

[derek-ho]

Reverts #3845

Preparing this revert PR in case we need to unblock folks who get main/2.x CI failures due to this change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (45917e9) 65.06% compared to head (814e0b9) 64.90%.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #3874      +/-   ##
============================================
- Coverage     65.06%   64.90%   -0.16%     
+ Complexity     3732     3664      -68     
============================================
  Files           297      292       -5     
  Lines         21000    20648     -352     
  Branches       3439     3401      -38     
============================================
- Hits          13663    13402     -261     
+ Misses         5633     5564      -69     
+ Partials       1704     1682      -22     

Files	Coverage Δ
...g/opensearch/security/support/ConfigConstants.java	95.23% <ø> (ø)

... and 5 files with indirect coverage changes

[peternied]

@derek-ho I don't think we need this and its out of date - I'm going to close this and we can reopen if we need it