[Test] add custom weights to rag indexes

[asamal4]

Description

Override query fusion class to use weights as it is instead of normalized weighted score.
This is currently an experimental/easy work-around to prioritize indexes.

[openshift-ci]

Skipping CI for Draft Pull Request.
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[asamal4]

/test all

[openshift-ci]

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[asamal4]

/retest

[asamal4]

/test all

[asamal4]

/hold

[openshift-ci]

@asamal4: all tests passed!

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