ref(metrics): Move equation and query symbol to components

[ArthurKnaus]

Move EquationSymbol and QuerySymbol to components/metrics folder.
Add tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.98%. Comparing base (e696b21) to head (f08bd77).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #72192   +/-   ##
=======================================
  Coverage   77.98%   77.98%           
=======================================
  Files        6576     6576           
  Lines      293026   293007   -19     
  Branches    50578    50574    -4     
=======================================
- Hits       228506   228500    -6     
+ Misses      58294    58269   -25     
- Partials     6226     6238   +12     

Files	Coverage Δ
static/app/components/metrics/equationSymbol.tsx	100.00% <ø> (ø)
static/app/components/metrics/querySymbol.tsx	95.00% <ø> (ø)
...ponents/modals/metricWidgetViewerModal/queries.tsx	0.00% <ø> (ø)
static/app/utils/metrics/dashboardImport.tsx	76.96% <ø> (ø)
static/app/views/dashboards/metrics/utils.tsx	77.52% <ø> (ø)
static/app/views/metrics/pageHeaderActions.tsx	0.00% <ø> (ø)
static/app/views/metrics/queries.tsx	0.00% <ø> (ø)
...app/views/metrics/utils/useFormulaDependencies.tsx	0.00% <ø> (ø)
static/app/views/metrics/utils/widgetToQuery.tsx	0.00% <ø> (ø)

... and 83 files with indirect coverage changes