fix(starfish): Handle free text search

[wmak]

• This fixes free text search on the span-metrics dataset so instead of handling something like query:test abc as message:"test abc" it'll now be handled as span.description:"test abc"
• This also identifies an issue with the metric layer where tag searching like this isn't supported

[codecov]

Codecov Report

Merging #54060 (2371efe) into master (e658f63) will increase coverage by 0.03%.
Report is 74 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head 2371efe differs from pull request most recent head b9b461e. Consider uploading reports for the commit b9b461e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #54060      +/-   ##
==========================================
+ Coverage   79.53%   79.57%   +0.03%     
==========================================
  Files        4974     4984      +10     
  Lines      210394   210775     +381     
  Branches    35836    35888      +52     
==========================================
+ Hits       167339   167717     +378     
- Misses      37907    37908       +1     
- Partials     5148     5150       +2     

Files Changed	Coverage Δ
...tatic/app/views/replays/replayTable/headerCell.tsx	66.66% <ø> (ø)
static/app/views/replays/replayTable/index.tsx	88.23% <ø> (ø)
static/app/views/replays/replayTable/tableCell.tsx	88.88% <ø> (ø)
src/sentry/search/events/builder/spans_metrics.py	42.10% <100.00%> (+2.10%)	⬆️

... and 66 files with indirect coverage changes