BREAKING CHANGE: `isExecutable` no longer always returns false and tries to determine execution status by file extension

Co-authored-by: Tom Payne <twpayne@gmail.com>

…ecutable of a particular name and returns the found path.

As per: twpayne#3141

This reverts commit ed0c798.

Adds a feature requested in discussion twpayne#3161.

- This reworks `gitHubLatestTag` to use `gitHubTags` and share the
  caching between the two functions.

- Pagination for both (both size and page number) is not configurable.
  This will always return the first page of items, where the size of the
  page is the default specified by GitHub. That is currently thirty
  items, but is subject to change.

[Homebrew on Linux was formerly referred to as Linuxbrew](https://docs.brew.sh/Homebrew-on-Linux). The two projects got merged.

The discussion in twpayne#3198 suggests some confusion about the order of
application. This adds a little more context.

The test for `.chezmoi.targetFile` is excluded from tests because of the
difference in path separators.

Resolves twpayne#3203

Bumps [golangci/golangci-lint-action](https://github.com/golangci/golangci-lint-action) from 3.6.0 to 3.7.0.
- [Release notes](https://github.com/golangci/golangci-lint-action/releases)
- [Commits](golangci/golangci-lint-action@639cd34...3a91952)

---
updated-dependencies:
- dependency-name: golangci/golangci-lint-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.5.3 to 3.6.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@c85c95e...f43a0e5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [goreleaser/goreleaser-action](https://github.com/goreleaser/goreleaser-action) from 4.3.0 to 4.4.0.
- [Release notes](https://github.com/goreleaser/goreleaser-action/releases)
- [Commits](goreleaser/goreleaser-action@336e299...3fa32b8)

---
updated-dependencies:
- dependency-name: goreleaser/goreleaser-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 4.0.1 to 4.1.0.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@fac708d...93397be)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [github/codeql-action](https://github.com/github/codeql-action) from 2.21.2 to 2.21.5.
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](github/codeql-action@0ba4244...00e563e)

---
updated-dependencies:
- dependency-name: github/codeql-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

…ready been executed

The added documentation serves as the rationale for this documentation
change:

If you use `fish` as your primary shell, you may get warnings from Fish
during the `.txtar` tests:

```
error: can not save history
warning-path: Unable to locate data directory derived from $HOME: '/home/user/.local/share/fish'.
warning-path: The error was 'Operation not supported'.
warning-path: Please set $HOME to a directory where you have write access.
```

These can be avoided with by running tests with `SHELL=bash` or
`SHELL=zsh`:

```console
$ SHELL=bash make test
$ SHELL=zsh make smoketest
$ SHELL=bash go test ./...
```

---

As a note, I tried to make `make test` re-execute when under `fish`, but
it requires some GNU make magic that may not work on all systems:

```Makefile
.PHONY: test
test:
ifeq ($(shell echo $$SHELL | grep -c fish$$),1)
	SHELL=$(SHELL) $(MAKE) test
else
	${GO} test -ldflags="-X github.com/twpayne/chezmoi/v2/internal/chezmoitest.umaskStr=0o022" ./...
	${GO} test -ldflags="-X github.com/twpayne/chezmoi/v2/internal/chezmoitest.umaskStr=0o002" ./...
endif
```

This can be added to this PR or made as a separate PR, if desired.