v2.1: use new feature gate for cu depletion (backport of #3994)

[mergify]

Problem

Firedancer prefers to have a separate feature gate for each SIMD, so rather than reusing and rekeying the existing replay cost tracker feature, we should create a new feature gate for solana-foundation/solana-improvement-documents#182.

Summary of Changes

• Revert feature id change for the replay cost tracker feature
• Add new feature gate for cu depletion

Fixes #
Feature Gate Issue: #3993

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This is an automatic backport of pull request #3994 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 11467d9 has failed:

On branch mergify/bp/v2.1/pr-3994
Your branch is up to date with 'origin/v2.1'.

You are currently cherry-picking commit 11467d9221.
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Unmerged paths:
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	both modified:   programs/bpf_loader/src/lib.rs
	both modified:   programs/sbf/tests/programs.rs
	both modified:   sdk/feature-set/src/lib.rs

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[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.