Fixed error when handling non-integer values in merged_lead_id in Snowflake

[lynziz]

Are you a current Fivetran customer?
Yes. Lynzi, VP Data Strategy & Operations, Renaissance Learning, Inc

What change(s) does this PR introduce?
The 'cast' to integer in this model errored out on the 3 values in our Marketo leads table with non-numeric values in merged_lead_id. Replaced cast with try_cast to avoid this on Snowflake.

Does this PR introduce a breaking change?

• Yes (please provide breaking change details below.)
• No -- this works in snowflake

Is this PR in response to a previously created Issue

• Yes, Issue [link issue number here]
• [ x] No

How did you test the PR changes?

• CircleCi
• Other -- I updated it in my local dbt environment and ran dbt test and dbt run successfully

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

• BigQuery
• Redshift
• Snowflake
• Postgres
• Databricks
• Other (provide details below)

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[fivetran-joemarkiewicz]

@lynziz my apologies for just seeing this PR! Thank you so much for opening the PR. I will give it a review ASAP.

[fivetran-joemarkiewicz]

@lynziz I just tested this on my end and was not seeing the same error on the original package within snowflake. Would you be able to provide some more context to your below statement?

our Marketo leads table with non-numeric values in merged_lead_id

My understanding is these id's should not have non-numeric characters within it?