Release v0.6.2 (#647)

* Added current version of UCX to task logs
([#566](#566)).
* Fixed `'str' object has no attribute 'value'` failure on apply backup
group permissions task
([#574](#574)).
* Fixed `crawl_cluster` failure over custom runtimes
([#602](#602)).
* Fixed `databricks labs ucx workflows` command
([#608](#608)).
* Fixed problematic integration test fixture `make_ucx_group`
([#613](#613)).
* Fixed internal API request retry logic by relying on concrete
exception types
([#637](#637)).
* Fixed `tables.scala` notebook to read inventory database from
`~/.ucx/config.yml` file.
([#614](#614)).
* Introduced `StaticTablesCrawler` for integration tests
([#632](#632)).
* Reduced runtime of `test_set_owner_permission` from 15 minutes to 44
seconds ([#636](#636)).
* Updated `LICENSE`
([#643](#643)).
* Updated documentation
([#611](#611),
[#646](#646)).

**Breaking changes** (existing installations need to remove `ucx`
database, reinstall UCX and re-run assessment jobs)
* Fixed external locations widget to return hostname for `jdbc:`-sourced
tables ([#621](#621)).

Author: nfx