phase five

[Vchen7629]

• feat(backend): created shared golang project for shared code across my go services
• refactor(backend): moved shared middleware package code like logging.go and cors.go into the shared go project
• refactor(backend): moved duplicated kv related code from go services into the shared folder under the kv package
• chore(shared): ran go mod tidy
• refactor(backend): moved health_check.go and shared queries.go for the storage package from individual services to shared folder to reduce duplication
• refactor(backend): moved the durable consumer creation into a seperate function in shared folder to reduce code duplication
• refactor(video-upload): renamed video.go to http.go and move start http api inside
• refactor(backend): moved duplicate publisher.go from transcoder-worker and video-recombiner to shared
• feat(ci): added shared ci and coverage
• chore(backend): updated go.work to include pipeline tests
• fix(ci): updated go version to 1.26.2
• chore(backend): update go.mod for go services to v1.26.2
• docs(readme): updated readme go badge
• fix(ci): added / to shared path filter**
• fix(ci): wrong shared coverage folder path