Split ECR include/exclude filters by newline

[nmaguiar]

Motivation

• The ECR MCP previously treated includere/excludere string inputs as a single pattern which blocked newline-delimited lists of regexes; this change accepts newline-separated regex lists per inline feedback.
• Allowing newline-separated regexes makes it easier to paste multi-line filter lists into the MCP parameters and keeps behavior consistent with list inputs.

Description

• When includere or excludere are provided as strings the code now calls split("\n").filter(r => r.length > 0) to coerce them into arrays and drop empty lines.
• Applied the newline-splitting/empty-line filtering in ECR List Images and ECR Get Repository Report before building the haystack and running regex matches.
• Preserves existing behavior when no filters are provided or when filters are already arrays, and continues to test each regex via new RegExp(...) against the assembled tag/digest haystack.

Testing

• No automated tests were executed for this change.
• No automated failures reported during the change application step.