Update src-cli's user-facing aspects for SCIP

[varungandhi-src]

• I think we should just have a src upload subcommand, instead of src lsif upload or src scip upload. The file extension provides enough context. Add src code-intel alias for src lsif #748
• Update to the latest scip version that includes this bugfix Implement "Find implementations" for classes, properties, and methods scip-typescript#136
  • Bump SCIP version to include bugfix for textDocument/implementations #751
• Cut a new patch release and update the src-cli generated docs in sg/sg, as part of the documentation work for SCIP.
  • release: Update changelog for 3.40.1 #752
  • doc update: Update to the latest src-cli release sourcegraph#36050

Previously, I updated the internals in #741.