cleanup old-style multiline parsers

[amfleurke]

deleted old-style multiline parsers, to remove some confusion.

fixes part of #10212

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• Chores
  • Removed legacy multiline log parsers for Couchbase (Erlang and Java) and generic Java.
  • These log formats are no longer recognized out of the box; existing setups relying on them will stop parsing as before.
  • Other parsing rules remain unchanged.

[coderabbitai]

Walkthrough

Removes three regex-based multiline parsers from configuration: couchbase_erlang_multiline and couchbase_java_multiline in conf/parsers_extra.conf, and java_multiline in conf/parsers_java.conf. No additions or modifications to remaining parsers.

Changes

Cohort / File(s)	Summary of Changes
Couchbase parser removals conf/parsers_extra.conf	Deleted two [PARSER] blocks: couchbase_erlang_multiline and couchbase_java_multiline, including their Regex, Time_Key, Time_Format, and Time_Keep settings.
Java multiline parser removal conf/parsers_java.conf	Deleted [PARSER] block java_multiline with its regex and time configuration.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I thump my paws and prune the vine,
Three regex tails snipped clean and fine.
Fewer hops through logs tonight,
Empty burrows, lighter byte.
Onward I bound—ears tuned tight,
To parse what’s left by morning light. 🥕🐇

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📥 Commits

Reviewing files that changed from the base of the PR and between 54acd76 and b6b57a0.

📒 Files selected for processing (2)

• conf/parsers_extra.conf (0 hunks)
• conf/parsers_java.conf (0 hunks)

💤 Files with no reviewable changes (2)

• conf/parsers_extra.conf
• conf/parsers_java.conf

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