Revert FTP integration improvements from 1.6.x

[niveathika]

Summary

Reverts #692
Reverts the FTP integration improvement set from 1.6.x so it can be carried via main instead.

Reverted commits

• Revert "Fix testcases" (cbf07055e9)
• Revert "Fix SpotBugs issues in FTP builders" (e4dbb57c13)
• Revert "Fix checkstyle failures" (74614a8909)
• Revert "Filter deprecated listener params and harden listener model resolution" (8e19eaa27d)
• Revert "Add FTP post-process actions for success/error" (04997d5ce0)

Notes

• Includes one follow-up compile fix for PackageUtil conflict resolution while reverting.

Validation

• ./gradlew :service-model-generator:service-model-generator-ls-extension:compileJava -x spotbugsMain

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[samithkavishke]

There is a check style violation can you resolve

[niveathika]

@samithkavishke Fixed with faa44f4

[samithkavishke]

@niveathika can you check this since original PR contains 19 files changed and this does not include all

[samithkavishke]

Some files does not match exactly the original PR changes

[niveathika]

I have cleaned up the branch without the PR