adjusted agg_multiselect_history incremental logi

[fivetran-joemarkiewicz]

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Fivetran created PR

What change(s) does this PR introduce?

This PR adjusts the incremental logic within int_jira__agg_multiselect_history to properly capture the relevant records since the last incremental run.

Does this PR introduce a breaking change?

• Yes (please provide breaking change details below.)
• No (please provide explanation how the change is non breaking below.)

As this PR implements an update to an incremental model, we will want to highlight this as a breaking change and for users to run --full-refresh on the first run after installing the latest version of the package.

Is this PR in response to a previously created Issue

• Yes, Issue BUG - new field values not being reflected in jira__issue_enhanced on incremental runs #41
• No

How did you test the PR changes?

• CircleCi
• Other (please provide additional testing details below)

Select which warehouse(s) were used to test the PR

• BigQuery
• Redshift
• Snowflake
• Postgres
• Databricks
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We are so excited you decided to contribute to the Fivetran community dbt package! We continue to work to improve the packages and would greatly appreciate your feedback on our existing dbt packages or what you'd like to see next.

[fivetran-joemarkiewicz]

Following the confirmation by @jcbmllgn that this works in their test environment, I am comfortable margining this on.