CLOUDP-114669: Automatically add trailing slash to the URL

[igor-karpukhin]

Description

This PR adds an ability for the Client to automatically add trailing slash (/) to the end of the provided URL. The motivation behind this is that some internal tools use this library and it is easier to assume that the library handles both cases: with, and without trailing slash.

cc: @jamesbroadhead

Link to any related issue(s): https://jira.mongodb.org/browse/CLOUDP-114669

Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Required Checklist:

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code

[andreaangiolillo]

LGTM

[igor-karpukhin]

@andreaangiolillo thanks for approving this PR. Could you please approve CI/CD workflow if you have one? Merge is not possible atm.

[gssbzn]

Before merging this we nened this chnages on the ops manager client

[gssbzn]

We keep atlas and ops manager compatible so we need this same change for https://github.com/mongodb/go-client-mongodb-ops-manager

[andreaangiolillo]

FYI: mongodb/go-client-mongodb-ops-manager#142

The same change has been merged in the ops manager go client