labs/lab-07: Modify checkers regexes to account for comments and edge cases

[Alexander1752]

• Modify checker regexes of (ideally all) tasks to ignore commented lines in the students' solutions, to avoid false positive detection of instructions usage. Some examples include:
  • [1] the comment at line 12 tricks the checker into believing that both a push and a pop instruction have been used
  • [2] the comment at line 17 matches the regex used to detect the pop instruction being used on the output array
• Fix and enhance the regex used in [3], line 24, for detecting a mov operation on the stack: at the moment, matching "[esp]" does not work properly due to the fact grep treats the square brackets as a regex character class, so it actually tries to match a single letter inside the brackets. Aside from this, the regex should match a broader spectrum of stack accesses, e.g. "[esp + 4 * edx + eax]", in case the student happens to not use the current access type at all.

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[1] https://github.com/cs-pub-ro/hardware-software-interface/blob/5231b9f14b33964a5f8f05507703fcb9c3cf83d2/labs/lab-07/tasks/max/support/max.asm
[2] https://github.com/cs-pub-ro/hardware-software-interface/blob/5231b9f14b33964a5f8f05507703fcb9c3cf83d2/labs/lab-07/tasks/reverse-array/support/reverse-array.asm
[3] https://github.com/cs-pub-ro/hardware-software-interface/blob/5231b9f14b33964a5f8f05507703fcb9c3cf83d2/labs/lab-07/tasks/local-var/tests/test.sh
[4] https://github.com/cs-pub-ro/hardware-software-interface/blob/main/CONTRIBUTING.md#pull-requests