Revert changes to Diffusion blame view
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Description

Revert changes to Diffusion blame view

Summary:
Ref PHI174. This reverts most of these changes:

These changes made the Diffusion blame view very similar to GitHub's blame view. See D18452 for a before/after of the bulk of these changes; the other revisions are bugfixes.

I think this was generally a step backward, and not motivated by solving a specific problem. I've found the new UI less usable than the old one, and at least one install (see PHI174) also has.

In particular, the revision/commit titles are very bulky and not terribly useful; the date column also isn't terribly useful; the "age" color actually IS pretty useful and was heavily de-emphasized.

I've kept one bugfix here (missing 'a' tag type) and kept the upgraded icon for "Skip Past This Commit".

I'm going to follow this up with some additional changes:

Show a small author profile icon, similar to GitHub, to address PHI174 more directly.
Try a zebra-stripe on blocks of rows to make it more clear where changes affected by a particular commit begin and end.
Try a hue shift, not just a brightness/saturation shift, to make the "age" color more distinct.
Try computing colors as even steps, not based purely on age. Currently, if a file has one long-distant commit and several recent commits, all the recent ones show up as very bright green. I think this would probably be more useful if they were distributed more evenly across the available color bands.

Test Plan:
Viewed blame views in Diffusion, saw a more compact UI similar to the old UI.