[rslex] Improve how we pass uri into request_builder

[albscui]

In rslex-pachyderm/src/pachyderm_stream_handler/request_builder.rs

impl RequestBuilder {
    /// Build a RequestBuilder from uri and SyncRecord.
    /// Return InvalidInput if uri is ill-formated.
    pub fn new(uri: &str, credential: String) -> StreamResult<RequestBuilder> {
        // Sometimes we get instantiated with uri like
        // commit.branch.repo/foo, sometimes like
        // http://localhost:30600/commit.branch.repo/foo workaround the latter
        // case by special-casing it for now.
        let the_uri = uri.strip_prefix("http://localhost:30600/").unwrap_or(uri);
...

[albscui]

Done