Force ffi gem to use Ruby platform gem

What does this MR do?

ffi v1.17.0 started shipping precompiled native gems for x86 and aarch64 Linux. However, these precompiled gems don't include the Omnibus library path (/opt/gitlab/embedded/lib) as part of the default LD_LIBRARY_PATH, so libraries such as libarchive can't be loaded from Omnibus.

Bundler allows us to ignore the precompiled gems by using force_ruby_platform in the Gemfile, so use this feature to effectively restore the behavior in previous ffi gem versions.

Related issues

Relates to #8590 (closed)

Testing

$ /opt/gitlab/embedded/bin/gem list ffi

*** LOCAL GEMS ***

ffi (1.17.0, 1.15.5)
ffi-compiler (1.0.1)
ffi-libarchive (1.1.14)
ffi-yajl (2.6.0)
llhttp-ffi (0.4.0)
public_suffix (5.0.5, 5.0.0)

Previously:

$ /opt/gitlab/embedded/bin/gem list ffi

*** LOCAL GEMS ***

ffi (1.17.0 x86_64-linux-gnu, 1.15.5)
ffi-compiler (1.0.1)
ffi-libarchive (1.1.14)
ffi-yajl (2.6.0)
llhttp-ffi (0.4.0)
public_suffix (5.0.5, 5.0.0)

libarchive test

Now:

$ /opt/gitlab/embedded/bin/irb
irb(main):001:0> require 'ffi-libarchive'
=> true

On systems that do not have libarchive installed:

$ /opt/gitlab/embedded/bin/irb
irb(main):001:0> require 'ffi-libarchive'
/opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/ffi-1.17.0-x86_64-linux-gnu/lib/ffi/dynamic_library.rb:94:in `load_library': Could not open library 'libarchive.so.13': libarchive.so.13: cannot open shared object file: No such file or directory. (LoadError)
Could not open library 'libarchive.13': libarchive.13: cannot open shared object file: No such file or directory.
Could not open library 'libarchive.13.so': libarchive.13.so: cannot open shared object file: No such file or directory.
Could not open library 'libarchive-13': libarchive-13: cannot open shared object file: No such file or directory.
Could not open library 'libarchive-13.so': libarchive-13.so: cannot open shared object file: No such file or directory.
Could not open library 'libarchive.so': libarchive.so: cannot open shared object file: No such file or directory.
Could not open library 'libarchive': libarchive: cannot open shared object file: No such file or directory.
Could not open library 'libarchive.so': libarchive.so: cannot open shared object file: No such file or directory.
Could not open library 'archive': archive: cannot open shared object file: No such file or directory.
Could not open library 'libarchive.so': libarchive.so: cannot open shared object file: No such file or directory.
Searched in <system library path>
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/ffi-1.17.0-x86_64-linux-gnu/lib/ffi/library.rb:95:in `block in ffi_lib'
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/ffi-1.17.0-x86_64-linux-gnu/lib/ffi/library.rb:94:in `map'
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/ffi-1.17.0-x86_64-linux-gnu/lib/ffi/library.rb:94:in `ffi_lib'
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/ffi-libarchive-1.1.14/lib/ffi-libarchive/archive.rb:11:in `<module:C>'
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/ffi-libarchive-1.1.14/lib/ffi-libarchive/archive.rb:4:in `<module:Archive>'
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/ffi-libarchive-1.1.14/lib/ffi-libarchive/archive.rb:3:in `<top (required)>'
	from <internal:/opt/gitlab/embedded/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:136:in `require'
	from <internal:/opt/gitlab/embedded/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:136:in `require'
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/ffi-libarchive-1.1.14/lib/ffi-libarchive.rb:56:in `<top (required)>'
	from <internal:/opt/gitlab/embedded/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:141:in `require'
	from <internal:/opt/gitlab/embedded/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:141:in `rescue in require'
	from <internal:/opt/gitlab/embedded/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:135:in `require'
	from (irb):1:in `<main>'
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/irb-1.4.1/exe/irb:11:in `<top (required)>'
	from /opt/gitlab/embedded/bin/irb:25:in `load'
	from /opt/gitlab/embedded/bin/irb:25:in `<main>'
<internal:/opt/gitlab/embedded/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:136:in `require': cannot load such file -- ffi-libarchive (LoadError)
	from <internal:/opt/gitlab/embedded/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:136:in `require'
	from (irb):1:in `<main>'
	from /opt/gitlab/embedded/lib/ruby/gems/3.1.0/gems/irb-1.4.1/exe/irb:11:in `<top (required)>'
	from /opt/gitlab/embedded/bin/irb:25:in `load'
	from /opt/gitlab/embedded/bin/irb:25:in `<main>'

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