Remove osmium from blacklisted formulas

Migrator: various rename fixes

Otherwise we could end up removing files unnecessarily.

This avoids needing to use `force: true` and still let's Homebrew do
what we want with our own taps.

ruby_requirement: fix path prepend

Migrate between different taps and delete relevant subdirectories if
they can be safely. Also, tweak some naming and use utility methods.

Use `oh1` for moving kegs to a new directory.

Move the checks for moving kegs to a new directory into the relevant
method (`move_to_new_directory`) instead. Also, delete duplicated
directories when we’ve confirmed they are definitely duplicated rather
than telling users to do so.

Add methods to determine if a migration is needed and perform it if so
(and no-op if not). Additionally, make `ARGV.force?` get passed as a
parameter so it can be overridden without requiring users to pass
`—force`.

Cleanup: Continue on error removing keg

Fixes #2355
Create unremovable_kegs instance var
Check cellar cleanup failure after full cleanup completes
Use module_function in Homebrew::Cleanup as we never instantiate the
class

formula: handle missing deps when formula missing.

formula: check installed_alias_path exists.

Fix handling of tap migrations to new cask names.

Include the pinned version in brew outdated output for pinned formulae

update-test: Use git fetch --tags --depth=1

formula_installer_spec: add default formula test.

Otherwise return `nil`.

Fixes https://github.com/Homebrew/brew/issues/2417

Need to check for two `/`s rather than one.

audit: check for unversioned formulae.

Update all references to taps.

We could try and get a partial result but given it'll also be wrong it
feels simpler to just return an empty array.

Fixes #1928.
Fixes #2027.
Closes #2058.
Fixes https://github.com/Homebrew/homebrew-core/issues/11827.

Add `Container::Executable`.

audit: Fix cctools invocation check regular expression.

Additionally, ignore the cctools formula itself, since it obviously
needs to check cctools invocations.

Test the situation where a requirement is satisfied by a non-formula
but the `default_formula` is also installed.

audit: Check for invocations of cctools.

diagnostic: increase minimum git version to 1.8.5

diagnostic: check homebrew/core git remote.

Use git fetch --tags --depth=1 to fetch fewer commits.

update-test: improve error handling.

older versions do not support the 'git -C <path>' option

Fail if the start or end commit are missing and retry finding the
previous tag by fetching all tags if they are missing.

This should fix CI on the current Homebrew/brew `master` branch.

Closes #2404.