fix: change ehCache storage location

[taban03]

Fix cache storage location to use correct env variable to avoid resource lock when reading cache directory in HA setup.
Add conditional creation via configuration on CacheConfig bean since the old -Dnet.sf.ehcache.disabled=true property is not supported anymore in ehCache v3.

Description

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• BREAKING CHANGE or !: Breaking change (fix or feature that would cause existing functionality to not work as expected)

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[pablocarle]

I think we should have a small test to verify that the default has a spring context with the real cache implementation and not the NoOp

[taban03]

I think we should have a small test to verify that the default has a spring context with the real cache implementation and not the NoOp

Added tests for both cache configs

[pablocarle]

Thank you!

[sonarcloud]

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