Bill Type Code not being formatted in Normalized Input Layer

[thutuva]

Describe the bug - Required
A clear and concise description of what the bug is.

Bill type code is being NULL'd when there are leading zeros as part of the code (e.g. 0111). The normalized input layer should be stripping out these zeros.

Environment - Required

• Tuva project package version (e.g. 0.6.0): 0.8.0
• dbt version (e.g. 1.7): 1.5
• dbt type (e.g. dbt cloud or dbt CLI): CLI
• Data warehouse (e.g. Snowflake): Snowflake

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.
Bill type codes are cleaned up in the tuva project when issues are minor like leading zeros.

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Additional context
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