Remove walk logsum step in ABM3

[bhargavasana]

It looks like walklogsum step (https://github.com/SANDAG/ABM/blob/ABM3_develop/src/main/emme/toolbox/master_run.py#L486) is not needed anymore.

• Remove it from EMME modeller and master_run.
• This creates two files "walkMgraEquivMinutes.csv" and "microMgraEquivMinutes.csv". Make sure that references to these files are removed as well. Please submit a pull request.

[bhargavasana]

The following are some files to resolve:

• https://github.com/SANDAG/ABM/blob/b1c95d73e0292993407b00aa341d4f05a152329e/src/main/java/org/sandag/abm/modechoice/MgraDataManager.java#L62
• https://github.com/SANDAG/ABM/blob/17e780dc5d23b8ad405a82d34115e555242861d4/src/main/python/calculate_micromobility.py#L18. This whole file can probably be removed.
• https://github.com/SANDAG/ABM/blob/17e780dc5d23b8ad405a82d34115e555242861d4/src/main/resources/sandag_abm.properties#L399