patched >2-digit tag-count padding in base reporter

Passing the CLI argument '--list-tags' outputs a list like:

```
All available tags:
  11  [mytag]
   4  [myothertag]
2 tags
```

However, the width of the tag-count column was previously hardcoded to 2, such that the formatting broke (with the tag names awkwardly misaligned/displaced) for 3+ digit tag counts. This occurred whenever a tag contains one hundred or more tests, and would result in formatting like:

```
All available tags:
  11  [mytag]
  100  [myjumbotag]
   4  [myothertag]
3 tags
```

This patch pre-computes the maximum number of digits among the tag counts, expanding the padding when there are more than 100 tests in a tag (and handling when tags are empty). It now outputs e.g.

```
All available tags:
   11  [mytag]
  100  [myjumbotag]
    4  [myothertag]
3 tags
```

0 files changed, 0 insertions, 0 deletions