Clean up generic String variants in error types #3267

	name: no_std check
	on:
	pull_request:
	paths:
	- .github/workflows/no-std.yaml
	- Makefile
	- '*.toml'
	- Cargo.lock
	- ci/no-std-check/**
	- ibc/**
	- ibc-core/**
	- ibc-apps/**
	- ibc-data-types/**
	- ibc-clients/**
	- ibc-primitives/**
	- ibc-derive/**
	push:
	tags:
	- v[0-9]+.*
	branches:
	- "release/*"
	- main

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: ${{ !startsWith(github.ref, 'refs/tags/') && github.ref != 'refs/heads/main' }}

	jobs:
	check-no-std-panic-conflict:
	name: Check no_std panic conflict
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions-rust-lang/setup-rust-toolchain@v1
	with:
	toolchain: stable
	- run: \|
	cd ci/no-std-check
	make check-no-std

	check-substrate:
	name: Check no_std substrate support
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions-rust-lang/setup-rust-toolchain@v1
	with:
	toolchain: nightly
	target: wasm32-unknown-unknown
	- run: \|
	cd ci/no-std-check
	make check-substrate

Provide feedback