Code nav: do not tokenize code views on Bitbucket

Created by: chrismwendt

Motivation: some code hosts have already tokenized the code view (e.g. Bitbucket). The tokenization currently prevents text selection from working on Bitbucket https://github.com/sourcegraph/sourcegraph/issues/4051

Implementation: this adds a boolean codeViewsRequireTokenization to the CodeHost interface, and passes it to codeintellify.

Depends on https://github.com/sourcegraph/codeintellify/pull/115

Test plan:

• Run Bitbucket locally
• Open a file
• Make sure text selections work

Fixes https://github.com/sourcegraph/sourcegraph/issues/4051

Slack conversation https://sourcegraph.slack.com/archives/CHXHX7XAS/p1559599129008000

Created by: codecov[bot]

Codecov Report

Merging #4412 into master will decrease coverage by 0.06%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4412      +/-   ##
==========================================
- Coverage   47.09%   47.02%   -0.07%     
==========================================
  Files         714      714              
  Lines       43182    43180       -2     
  Branches     1741     1741              
==========================================
- Hits        20335    20306      -29     
- Misses      20939    20972      +33     
+ Partials     1908     1902       -6

Impacted Files	Coverage Δ
browser/src/libs/phabricator/code_intelligence.ts	52.85% <ø> (ø)
...r/src/libs/code_intelligence/code_intelligence.tsx	70.31% <ø> (ø)
browser/src/libs/github/code_intelligence.ts	51.26% <ø> (ø)
browser/src/libs/bitbucket/code_intelligence.tsx	67.18% <ø> (ø)
browser/src/libs/gitlab/code_intelligence.ts	71.42% <ø> (ø)
cmd/frontend/graphqlbackend/git_tree_entry.go	2.83% <0%> (-12.92%)
cmd/frontend/graphqlbackend/git_tree.go	52.08% <0%> (-12.51%)
cmd/frontend/graphqlbackend/git_revision.go	0% <0%> (-7.41%)
cmd/frontend/graphqlbackend/git_commit.go	21.01% <0%> (-5.08%)