fix(Qdrant): Collection Exists API return type

[Anush008]

Description

This API endpoint returns a boolean not a string.
Ref: https://api.qdrant.tech/v-1-12-x/api-reference/collections/collection-exists#response.body.result.exists

[vmanoharas]

Dear Partner

I hope you are doing well.
Congratulations, your pull request is approved. We will move forward with the certification process. We are preparing your connector for production deployment and will queue up for the next deployment schedule. Once your connector onboards the next deployment schedule, it starts to deploy your connector in our production environments that typically takes 3-4 weeks.
Please let us know if you have any questions.
Thank you very much for working with us.

[vmanoharas]

[[certify-connector]]