refactor!: remove 24-host path function in favour of sybling key functions (backport #7016)

[mergify]

Description

closes: #6882

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against the correct branch (see CONTRIBUTING.md).
• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Code follows the module structure standards and Go style guide.
• Wrote unit and integration tests.
• Updated relevant documentation (docs/).
• Added relevant godoc comments.
• Provide a conventional commit message to follow the repository standards.
• Include a descriptive changelog entry when appropriate. This may be left to the discretion of the PR reviewers. (e.g. chores should be omitted from changelog)
• Re-reviewed Files changed in the GitHub PR explorer.
• Review SonarCloud Report in the comment section below once CI passes.

---

This is an automatic backport of pull request #7016 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of f4eba71 has failed:

On branch mergify/bp/release/v9.0.x/pr-7016
Your branch is up to date with 'origin/release/v9.0.x'.

You are currently cherry-picking commit f4eba717.
  (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:
	modified:   modules/core/04-channel/keeper/grpc_query.go
	modified:   modules/core/04-channel/keeper/keeper.go
	modified:   modules/core/24-host/channel_keys.go
	deleted:    modules/core/24-host/channel_paths.go
	modified:   modules/core/24-host/client_keys.go
	deleted:    modules/core/24-host/client_paths.go
	modified:   modules/core/24-host/connection_keys.go
	deleted:    modules/core/24-host/connection_paths.go
	modified:   modules/core/24-host/packet_keys.go
	deleted:    modules/core/24-host/packet_paths.go
	modified:   modules/core/24-host/parse_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   docs/docs/05-migrations/13-v8-to-v9.md

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

[DimitrisJim]

note, took liberty of completely dropping docs folder instead of fixing conflicts there.

[colin-axner]

Removing docs breaks markdown links, but we shouldn't be linking from the release branch anyways

[colin-axner]

Thanks for picking this up @DimitrisJim !

[DimitrisJim]

Removing docs breaks markdown links, but we shouldn't be linking from the release branch anyways

yup, let me just drop that too. we shouldn't have it in release branches.

[sonarcloud]

Quality Gate passed for 'ibc-go'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud