rptest: fix formatting in redpanda.py · ballard26/redpanda@ef9131f

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

variable does not need to be mutable

function `batch_header_crc` is never used

method `inject_partition_manifest` is never used

variants `EndOfStream` and `TrailingBytes` are never constructed

enum `PartitionManifestFormat` is never used

associated items `new` and `push` are never used

function `varint_encode_to` is never used

function `varint_size` is never used

`rp_storage_tool` (bin "rp-storage-tool") generated 8 warnings (run `cargo fix --bin "rp-storage-tool"` to apply 1 suggestion)

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

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