feat: parse home flag earlier (backport #20771)

[mergify]

Description

Closes: #20769

• Add home directory helper in client/v2
• Delete hack api that were adding
• Update usage

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• included the necessary unit and integration tests

• added a changelog entry to CHANGELOG.md

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Summary by CodeRabbit

• New Features

  • Introduced GetNodeHomeDirectory helper function for determining the home directory based on various inputs.
  • Improved clarity of environment variables by renaming GAIA_HOME to NODE_HOME and GAIA_NODE to NODE_NODE.

• Bug Fixes

  • Updated the rm commands in initialization scripts to include the -v flag for verbose output.

• Refactor

  • Integrated functionality from ReadDefaultValuesFromDefaultClientConfig into CreateClientConfig.
  • Modified flag and home path handling within several commands and configuration files.

• Chores

  • Enhanced upgrade flow to create the upgrade directory only when necessary.
  • Added viper as a direct dependency for configuration handling.

---

This is an automatic backport of pull request #20771 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 5aaff21 has failed:

On branch mergify/bp/release/v0.50.x/pr-20771
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit 5aaff2109.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   client/v2/helpers/home.go
	modified:   docs/docs/learn/advanced/07-cli.md
	modified:   scripts/init-simapp.sh
	modified:   simapp/simd/cmd/commands.go
	modified:   x/upgrade/keeper/keeper.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   client/config/config.go
	both modified:   client/v2/CHANGELOG.md
	deleted by us:   scripts/simapp-v2-init.sh
	deleted by us:   server/v2/cometbft/flags/flags.go
	deleted by us:   server/v2/commands.go
	deleted by us:   simapp/CHANGELOG.md
	both modified:   simapp/app.go
	both modified:   simapp/app_v2.go
	both modified:   simapp/simd/cmd/root.go
	both modified:   simapp/simd/cmd/root_v2.go
	deleted by us:   simapp/v2/app_di.go
	deleted by us:   simapp/v2/simdv2/cmd/commands.go
	deleted by us:   simapp/v2/simdv2/cmd/root_di.go
	both modified:   x/upgrade/CHANGELOG.md
	deleted by us:   x/upgrade/depinject.go
	both modified:   x/upgrade/go.mod

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[julienrbrt]

I'll revert a bunch (keep only upgrade, simapp and client/v2) and fix the conflicts