Improve regex to accept white spaces before delimiters(release-automation)

[AjayJagan]

Description

Allows regex to accept whitespace before and after the delimiter '|' because when added without a whitespace github bleeds the url and makes it redirect to a malformed URL.

JIRA: https://issues.redhat.com/browse/RHOAIENG-9630

context: https://docs.google.com/document/d/1YX0zAxkl4N6-K5t4INsBqnUAxTN0GDPWV1jn9XjkgPg/edit?disco=AAABQq9SeXI

How Has This Been Tested?

The text to test is

#Release#\n\ndata-science-pipelines-operator|https:
//github.com/opendatahub-io/data-science-pipelines-operator/tree/v2.0.1 |https://github.com/opendatahub-io/data-scienc
e-pipelines-operator/releases/tag/v2.0.1

and the code to test is https://github.com/opendatahub-io/opendatahub-operator/blob/incubation/.github/scripts/get-release-branches.js#L22-L39
with the modified regex from the pr.

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