Fix monitor/3 BIF in noproc scenarios

[rickard-green]

The monitor/3 BIF did not apply options to the created monitor if the target process or port did not exist. That is, the corresponding down message would get a DOWN tag even if a custom tag had been set, and the returned reference was not an alias even if the alias option had been passed.

Fixes #6185

[github-actions[bot]]

CT Test Results

       3 files     125 suites   41m 7s :stopwatch: 1 455 tests 1 413 :heavy_check_mark: 42 :zzz: 0 :x: 1 754 runs  1 695 :heavy_check_mark: 59 :zzz: 0 :x:

Results for commit 7cecc256.

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