fix(query): Updating Regex to support preagg metric names with column selector

[sandeep6189]

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• The commit(s) message(s) follows the contribution guidelines ?
• Tests for the changes have been added (for bug fixes / features) ?
• Docs have been added / updated (for bug fixes / features) ?

Current behavior :

Streaming aggregation creates new metric names of the format {metric_name}:::{rule_name}. The current toLogicalPlan method incorrectly splits the aggregated metric name into a metric name and column name. For example, for following aggregated metric, where no column name is specified, the regex breaks the metric name into following:

1. "http_requests_total:::aggregated_rule" --> metric_name: (http_requests_total:) column_name: (aggregated_rule)

New behavior : Fixed the regex used to accommodate this scenario

[sherali42]

thanks @sandeep6189 for taking this up 👍