* origin/develop:
  Fix connection removal bug (#9137)
  Add source map validator to CI (#9135)
  Update source map validator target files (#9133)
  Improve sourcemap validator console report (#9131)
  Add `validate-source-maps` npm script (#9134)
  Non-zero exit code upon failure to validate source maps (#9132)
  remove unused tx-list styles (#9121)
  delete unused confirm styles (#9118)

The report printed to the console for invalid source map samples has
been improved in a few ways:

* The entire message is now printed using `console.error`, so the
contents aren't split between STDERR and STDOUT
* The code fence is now guaranteed to be a set length, rather than it
varying depending on the filename
* The code fence is no longer padded on the inside with newlines, which
results in a more compact output that is (in my opinion) just as
readable.

* origin/master: (44 commits)
  Add category in eventOpts (#9164)
  Update changelog for v8.0.7 (#9161)
  Version v8.0.7
  Remove web3 e2e tests (#9159)
  Add web3 usage metrics, prepare for web3 removal (#9144)
  Use `pathname` instead of URL for `currentPath` metrics parameter (#9158)
  Remove `url` parameter from `metricsEvent` (#9157)
  Change MetaMetrics category for background events (#9155)
  remove .network-name height
  Use luxon@1.24.1 (#9154)
  Update 'react-devtools' to ^4.8.0 (#9140)
  Fix connection removal bug (#9137)
  Add source map validator to CI (#9135)
  Update source map validator target files (#9133)
  Improve sourcemap validator console report (#9131)
  Add `validate-source-maps` npm script (#9134)
  Non-zero exit code upon failure to validate source maps (#9132)
  Update `brfs` from v1.6.1 to v2.0.2 (#9115)
  Factor out `getEnvironment` function in build script (#9114)
  Update `browserify` from v16.2.3 to v16.5.1 (#9113)
  ...