Accelerate block tag iteration

[peterallenwebb]

resolves https://github.com/dbt-labs/dbt-core/issues/9037

Description

The process of finding and iterating through jinja blocks could be quite slow. These changes accelerate the process by caching useful information about what searches have already been performed.

Many thanks to @fredriv for pointing out that this was still a problem and pushing for a fix.

Checklist

• [x] I have read the contributing guide and understand what's expected of me
• [x] I have signed the CLA
• [x] I have run this code in development and it appears to resolve the stated issue
• [x] I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• [x] I have run changie new to create a changelog entry

[github-actions[bot]]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.48%. Comparing base (ed11c6c) to head (6b18e61).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #205 +/- ## ========================================== + Coverage 68.33% 68.48% +0.14% ========================================== Files 52 52 Lines 3373 3389 +16 ========================================== + Hits 2305 2321 +16 Misses 1068 1068 ``` | [Flag](https://app.codecov.io/gh/dbt-labs/dbt-common/pull/205/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/dbt-labs/dbt-common/pull/205/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs) | `68.48% <100.00%> (+0.14%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.