Remove remaining RSA-OAEP filters in OIDC Client and Back-Channel logout tests

[tloodu]

• I have considered the risk of behavior change or other zero migration impact (https://github.com/OpenLiberty/open-liberty/wiki/Behavior-Changes).
• If this PR fixes an Issue, the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN" (verify release bug label if applicable: https://github.com/OpenLiberty/open-liberty/wiki/Open-Liberty-Conventions).
• If this PR resolves an external Known Issue (including APARS), the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN".

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• Remove properties file which allows for RSA-OAEP in com.ibm.ws.security.oidc.client_fat.2, com.ibm.ws.security.social_fat.LibertyOP.backchannelLogout.1 and com.ibm.ws.security.oidc.client_fat.backchannelLogout.1
• Update/create test cases to encrypt with ECDH-ES where possible
• Disable tests which explicitly test with RSA-OAEP from running when FIPS is enabled.
• Cleanup of general comments

[tloodu]

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[tloodu]

SOE Results (FIPS): https://libh-proxy1.fyre.ibm.com/cognitive/pipelineAnalysis.html?pipelineId=695a8b0b-c401-4448-8ca9-da36f9e283d3

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[tloodu]

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[tloodu]

FIPS PB Results: https://libh-proxy1.fyre.ibm.com/cognitive/pipelineAnalysis.html?pipelineId=f60a147a-8151-43bb-a7f4-9015d6337392

[tloodu]

Failure in build is unrelated to the changes in this PR.

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[tloodu]

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