Custom example still uses some old macros

[rlh1994]

Describe the bug

Custom examples still use old macros in some places, we should replace these e.g.

dbt-snowplow-web/custom_example/models/snowplow_web_custom_modules/page_views/page_view_channel_engagement/databricks/snowplow_web_pv_channel_engagement.sql

Lines 15 to 16 in e4ae6b2

	partition_by = snowplow_utils.get_partition_by(databricks_val='start_tstamp_date'),
	snowplow_optimize=true

Steps to reproduce

Expected results

Actual results

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System information

The contents of your packages.yml file:

# contents goes here

Which database are you using dbt with?

• postgres
• redshift
• bigquery
• snowflake
• databricks
• other (specify: ____________)

The output of dbt --version:

<output goes here>

The operating system you're using:

The output of python --version:

Additional context

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