[toplevel] Deprecate the `-compile` flag in favor of `coqc`.

This PR deprecates the use of `coqtop` as a compiler.

There is no point on having two binaries with the same purpose; after
the experiment in #8690, IMHO we have a lot to gain in terms of code
organization by splitting the compiler and the interactive binary.

We adapt the documentation and adapt the test-suite.

Note that we don't make `coqc` a true binary yet, but here we take
care only of the user-facing part.

The conversion of the binary will take place in #8690 and will bring
code simplification, including a unified handling of arguments.

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