chore(op-service): reduce allocations

[hoank101]

Description

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Metadata

• Fixes #[Link to Issue]

[coderabbitai]

Walkthrough

The recent updates focus on optimizing memory allocation for variables in various parts of the codebase. Changes include initializing variables with specific capacities based on input array lengths to enhance memory management and potentially improve performance by reducing dynamic resizing during runtime.

Changes

File Path	Change Summary
op-service/metrics/doc/cmd.go	Updated NewSubcommands to initialize data with capacity based on supportedMetrics length.
op-service/sources/batching/bound.go	Adjusted indexed initialization in DecodeEvent to use capacity determined by event.Inputs.
op-service/sources/l1_beacon_client.go	Modified fetchSidecars to allocate errs capacity based on cl.pool.Len().
op-service/txmgr/txmgr.go	Altered MakeSidecar to initialize blobHashes with capacity based on blobs slice length.

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