vbotbuildovich

Backport of PR https://github.com/redpanda-data/redpanda/pull/7412 Fixes https://github.com/redpanda-data/redpanda/issues/7440,

Backport https://github.com/redpanda-data/redpanda/issues/6446 to branch v22.3.x. Requested by PR https://github.com/redpanda-data/redpanda/pull/7412

Backport of PR https://github.com/redpanda-data/redpanda/pull/7413

Backport of PR https://github.com/redpanda-data/redpanda/pull/7406

Backport of PR https://github.com/redpanda-data/redpanda/pull/7297 Fixes https://github.com/redpanda-data/redpanda/issues/7435,

Backport https://github.com/redpanda-data/redpanda/issues/6902 to branch v22.3.x. Requested by PR https://github.com/redpanda-data/redpanda/pull/7297

Backport of PR https://github.com/redpanda-data/redpanda/pull/7244

[v22.2.x] treewide: Small cleanups for llvm-15

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Backport of PR https://github.com/redpanda-data/redpanda/pull/7349

Backport of PR https://github.com/redpanda-data/redpanda/pull/7408

Backport https://github.com/redpanda-data/redpanda/issues/5558 to branch v22.3.x. Requested by PR https://github.com/redpanda-data/redpanda/pull/7351