feat: migrate forc-client from sway to forc monorepo

[JoshuaBatty]

Summary

This PR enables fuelup to source forc-client from the FuelLabs/forc monorepo starting with version 0.71.0, following the ongoing migration of Fuel tooling as outlined in the RFC.

Changes

• Update components.toml with forc-client migration config
• Update tag_for_version() to handle forc-client tags in forc monorepo
• Update proxy_cli.rs to handle forc-client executables for toolchain overrides
• Remove forc-client executables from forc component (now separate)
• Add tests for forc-client version routing

Version Routing

Version	Repository	Tarball	Tag Format
< 0.71.0	sway	forc-binaries-{target}.tar.gz	v{version}
≥ 0.71.0	forc	forc-client-{version}-{target}.tar.gz	forc-client-{version}

Related PRs

This is part of the broader effort to migrate Fuel tooling from the sway monorepo to the forc monorepo:

• RFC: Tooling Monorepo sway-rfcs#49
• forc-client migration: Migrate forc-client from the sway repo forc#143
• sway-nightly-binaries: feat: migrate forc-client nightly builds to forc monorepo sway-nightly-binaries#83
• Groundwork PRs:
  • feat: enable forc-wallet migration from standalone repo to forc monorepo #807 (forc-wallet migration)
  • feat: migrate forc-crypto from sway to forc monorepo #808 (forc-crypto migration)
  • feat: migrate forc-node from sway to forc monorepo #819 (forc-node migration)

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PR Summary

Medium Risk
Changes how forc-call/forc-deploy/forc-run/forc-submit are resolved and downloaded across toolchain overrides and version cutovers; mistakes could break installs or proxy execution for these binaries.

Overview
Starting with 0.71.0, forc-client is now sourced from the FuelLabs/forc monorepo with component-prefixed tags and its own tarball prefix, while older versions continue to resolve from sway/forc-binaries via new legacy routing in components.toml.

forc-call/forc-deploy/forc-run/forc-submit are removed from the forc component and are treated as executables bundled under forc-client for fuelup component add validation and proxy/override resolution (proxy_cli.rs). Tests are added/updated to cover repository/tag/tarball selection and target triple handling for forc-client.

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[github-actions]

LCOV of commit 889a486 during CI #2314

Summary coverage rate:
  lines......: 86.9% (2515 of 2893 lines)
  functions..: 60.0% (375 of 625 functions)
  branches...: 66.0% (272 of 412 branches)

Files changed coverage rate: n/a

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