[vcpkg] Warn on unmatched removal with reasonable alternative

[ras0219-msft]

This PR causes vcpkg to warn if the user attempts to remove a package that is not installed, but has the same port installed in a different triplet.

Before:

> ./vcpkg remove zlib:x64-windows --dry-run
The following packages are not installed, so not removed:
    zlib:x64-windows

> ./vcpkg remove zlib:x86-windows --dry-run
The following packages will be removed:
  * cpprestsdk:x86-windows
    zlib:x86-windows
Additional packages (*) need to be removed to complete this operation.
If you are sure you want to remove them, run the command with the --recurse option

After:

> .\toolsrc\out\build\x64-Release\vcpkg remove zlib:x64-windows --dry-run
The following packages are not installed, so not removed:
    zlib:x64-windows
Another installed package matches the name of an unmatched request. Did you mean zlib:x86-windows?
Another installed package matches the name of an unmatched request. Did you mean zlib:arm64-windows?
Another installed package matches the name of an unmatched request. Did you mean zlib:x64-uwp?

> .\toolsrc\out\build\x64-Release\vcpkg remove zlib:x86-windows --dry-run
The following packages will be removed:
  * cpprestsdk:x86-windows
    zlib:x86-windows
Additional packages (*) need to be removed to complete this operation.
If you are sure you want to remove them, run the command with the --recurse option

Additionally, I have deprecated the (relatively) undocumented "purge" feature and removed extraneous messages to reduce noise.

• Does your PR follow the maintainer guide?

Yes