[build] Add go mod tidy before go mod vendor for Go 1.24 compat (#157)

What: Adds a go mod tidy step before go mod vendor in the Makefile's $(GO_DEPS) target, with a version guard that only runs tidy when installed Go >= go.mod's directive.

Why: Go 1.24 (Debian Trixie) enforces stricter module graph consistency, causing go mod vendor to fail unless go mod tidy runs first. On older Go (e.g. bookworm Go 1.21), tidy is skipped — no behavior change.

How: Shell-based version comparison using sort -V to compare installed Go version against go.mod directive. Same pattern as sonic-mgmt-common#207.

Testing: CI green, built successfully under Trixie (Go 1.24) and bookworm (Go 1.21). PR approved.

Signed-off-by: Rustiqly <rustiqly@users.noreply.github.com>

Author: rustiqly

Makefile

@@ -37,6 +37,15 @@ $(GO_MOD):
 	$(GO) mod init github.com/Azure/sonic-mgmt-framework
 
 $(GO_DEPS): $(GO_MOD) $(GO_CODEGEN_INIT)
+	@# Run go mod tidy only if installed Go >= go.mod's go directive
+	@GO_MOD_VER=$$(sed -n 's/^go //p' go.mod) && \
+	 GO_CUR_VER=$$($(GO) env GOVERSION | sed 's/go//') && \
+	 if printf '%s\n' "$$GO_MOD_VER" "$$GO_CUR_VER" | sort -V | head -1 | grep -qx "$$GO_MOD_VER"; then \
+	   echo "Running go mod tidy (Go $$GO_CUR_VER >= go.mod $$GO_MOD_VER)"; \
+	   $(GO) mod tidy; \
+	 else \
+	   echo "Skipping go mod tidy (Go $$GO_CUR_VER < go.mod $$GO_MOD_VER)"; \
+	 fi
 	$(GO) mod vendor
 	$(MGMT_COMMON_DIR)/patches/apply.sh vendor
 	touch  $@