cluster-ui: enable active execs blocking info for CC dedicated

[xinhaoz]

This commit enables wait time insights for active executions pages on CC Dedicated. This includes the Time Spent Waiting column in the overview pages and the wait time insights panel in the details pages. The feature is still gated for serverless.

Release note (ui change): Dedicated CC now contains information for which transactions are blocked / waiting on the active execution pages. This includes the Time Spent Waiting column in the overview pages and the wait time insights panel on the details pages. Feature currently unavailable for serverless.

[cockroach-teamcity]

This change is 

[xinhaoz]

https://www.loom.com/share/9a3c1c9a62694a2d8f2061d748fda4d5

Since I couldn't connect as a user to run queries, it's just showing here the network request being made (and not being made on serverless). The time spent waiting column is also hidden/visible when appropriate.

[xinhaoz]

TFTR!!! bors r+

[craig[bot]]

Build failed (retrying...):

• Bazel Essential CI (Cockroach)

[craig[bot]]

Build failed (retrying...):

• Bazel Essential CI (Cockroach)

[craig[bot]]

Build succeeded:

• Bazel Essential CI (Cockroach)

[maryliag]

can you backport this to 22.2 so we can publish a new cluster-ui with those changes?

[xinhaoz]

blathers backport 22.2