refactor: deprecate AuthToken for non-OG pyroscope cloud

[marcsanmi]

Closes #124

This PR deprecates the use of AuthToken for non-OG Pyroscope cloud.

Changes:

• Added deprecation notices to AuthToken in Config structs
• Updated authentication logic in uploadProfile function
• Added warning for deprecated AuthToken usage with non-OG Pyroscope cloud
• Maintained AuthToken support for OG Pyroscope cloud servers
• Ensured BasicAuth is used when provided, regardless of server type

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[korniltsev]

nit: maybe add a test if possible and you think it may be useful, but I don't think it is required

[marcsanmi]

I added tests for the uploadProfile function in the remote package, covering various authentication scenarios. I also Introduced a new internal/testutil package with a TestLogger for shared testing utilities, following a similar approach used in projects like Prometheus.

Note that some functions and packages in the SDK still lack tests. We should keep adding them as we continue working on it.

[korniltsev]

Awesome