Allowing the timestamp dynamic variable to have a format parameter.

[misholson]

Description

This enhances the dynamic variables by allowing you to add a pipe followed by a parameter defining how that variable is generated. Then we implement that for the $timestamp variable. If $timestamp is specified by itself, its behavior is the same, but now you could also specify $timestamp|yyyyMMDD to get a timestamp that looks like 20251021. Any format string supported by moment is supported.

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• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
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  Closes Allow format strings for the $timestamp dynamic variable #5861

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