Remove extra supports for --dump-all-passes-fortran

[Shaikh-Ubaid]

towards #2744.

Now it can only be used as lfortran main.f90 --dump-all-passes-fortran which is the same as how --dump-all-passes used to work previously before PR #2733 was merged.

[Shaikh-Ubaid]

As described here #2733 (comment), we mentioned that we can use the ASR dumping as lfortran examples/expr2.f90 --show-asr --tree --dump-all-passes, but with this PR #2749, we have the following changes:

• The --show-asr is not required or should not be used while dumping the ASR passes output. This is the same working as we used to have for --dump-all-passes before Support dumping ASR pass outputs in Json, Tree and Visualization forms  #2733 was merged.
• Similar to --show-asr, --show-fortran should not be used while dumping the ASR passes output. One can simply use lfortran examples/expr2.f90 --dump-all-passes or lfortran examples/expr2.f90 --dump-all-passes --json/tree.

[certik]

I think that's fine.