tools/mpremote: Fix argument handling for follow and add help strings.

Fixes in this commit are:
- Make --follow the default for "run" (accidentally changed in 68d094358).
- Add help strings for "repl": --capture --inject-file --inject-code
- Update help strings for "run".
- Fix encoding for --inject-code (accidentally broken in 68d094358).
- Remove ability to --no-follow for "eval". It was there previously because
  it shared the same code path with "exec" and "run", but makes no sense
  for "eval", so might as well remove.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

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