Improve perf of JS tests, fix proptype warnings

[benvinegar]

Besides fixing propType warnings (which cleans terminal output, see below), this patch improves performance by using shallow renderer instead of mount where possible.

Benchmarks

Run	1	2	3
Before	15.276s	14.6s	18.888s
After	9.118s	8.564s	8.517s

notbad.jpg

---

Console output after changes:

(sentry)➜  sentry git:(js-test-cleanup) npm test

> Sentry@0.0.0 test /Users/benvinegar/Projects/sentry
> NODE_ENV=test node_modules/.bin/jest tests/js/spec

 PASS  tests/js/spec/views/stream/searchBar.spec.jsx
 PASS  tests/js/spec/components/assigneeSelector.spec.jsx
 PASS  tests/js/spec/views/stream.spec.jsx
 PASS  tests/js/spec/views/groupActivity/index.spec.jsx
 PASS  tests/js/spec/views/releaseArtifacts.spec.jsx
 PASS  tests/js/spec/views/projectReleases.spec.jsx
 PASS  tests/js/spec/views/organizationTeams.spec.jsx
 PASS  tests/js/spec/components/eventsPerHour.spec.jsx
 PASS  tests/js/spec/components/events/interfaces/richHttpContent.spec.jsx
 PASS  tests/js/spec/components/events/interfaces/breadcrumbComponents/breadcrumbs.spec.jsx
 PASS  tests/js/spec/views/projectInstall/platform.spec.jsx
 PASS  tests/js/spec/views/stream/actions.spec.jsx
 PASS  tests/js/spec/components/avatarCropper.spec.jsx
 PASS  tests/js/spec/views/ruleEditor/ruleNodeList.spec.jsx
 PASS  tests/js/spec/components/stackedBarChart.spec.jsx
 PASS  tests/js/spec/views/stream/actionLink.spec.jsx
 PASS  tests/js/spec/views/groupDetails/seenBy.spec.jsx
 PASS  tests/js/spec/components/events/interfaces/breadcrumbComponents/httpRenderer.spec.jsx
 PASS  tests/js/spec/components/group/tagDistributionMeter.spec.jsx
 PASS  tests/js/spec/components/issues/snoozeAction.spec.jsx
 PASS  tests/js/spec/components/avatar.spec.jsx
 PASS  tests/js/spec/components/contextData.spec.jsx
 PASS  tests/js/spec/components/events/interfaces/rawStacktraceContent.spec.jsx
 PASS  tests/js/spec/components/events/interfaces/keyValueList.spec.jsx
 PASS  tests/js/spec/components/events/interfaces/frame.spec.jsx
 PASS  tests/js/spec/components/userLetterAvatar.spec.jsx
 PASS  tests/js/spec/stores/selectedGroupStore.spec.js
 PASS  tests/js/spec/api.spec.jsx
 PASS  tests/js/spec/components/letterAvatar.spec.jsx
 PASS  tests/js/spec/components/dropdownLink.spec.jsx
 PASS  tests/js/spec/utils/streamManager.spec.js
 PASS  tests/js/spec/stores/alertStore.spec.js
 PASS  tests/js/spec/components/events/interfaces/utils.spec.jsx
 PASS  tests/js/spec/stores/groupStore.spec.jsx
 PASS  tests/js/spec/stores/streamTagStore.spec.jsx
 PASS  tests/js/spec/utils/logging.spec.jsx
 PASS  tests/js/spec/utils/marked.spec.jsx
 PASS  tests/js/spec/utils/utils.spec.jsx
 PASS  tests/js/spec/utils/stream.spec.jsx
 PASS  tests/js/spec/helpers/formatters.spec.jsx

Test Suites: 40 passed, 40 total
Tests:       222 passed, 222 total
Snapshots:   0 total
Time:        10.13s
Ran all test suites matching "tests/js/spec".

[benvinegar]

Since this only affects tests, merging.