3804 Removal of Depricated Java Engine Resources

[axsaucedo]

What this PR does / why we need it:
The Deprication of Java Engine Service Orchestrator started in 1.0 and fully finalised in 1.1. Since then the Java engine has been present but with deprication warning as no further maintenance upgrades taking place. The Java engine is now being removed toegether with all relevant references as it no longer receives feature, maintenance nor security updates.

Which issue(s) this PR fixes:

Fixes #3804

Included in this PR

• Remove engine Java codebase
• Remove CI references that build the image
• Remove code paths that created depricated Java engine
• Removing documentation references that use the engine
• Add notes on UPGRADING.md about removal

[seldondev]

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[axsaucedo]

/test integration

[axsaucedo]

/test notebooks

[axsaucedo]

Notebook tests only one test failed - namely test_server_examples, I will run locally and will rerun integration tests
/test integration

[axsaucedo]

/test integration

[axsaucedo]

/test integration

[axsaucedo]

/test integration

[axsaucedo]

Running the CI locally passes with only errors in known failing tests outlined in #3856 and #3857. Will rerun but we should be good for review.
/test integration

[axsaucedo]

/test integration

[seldondev]

@axsaucedo: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
notebooks	777b9c0	link	/test notebooks
integration	7723364	link	/test integration

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