Add Xcode project for Teleport Verify; add gomobile as tool dep (#67750)

* Generate Xcode project for Verify

* Set Swift version to 6; remove macOS and Vision as destinations

* Handle `teleport://` links and add enrollment screen

* Avoid building macOS-specific stuff on iOS

This is needed for gomobile to build our stuff from lib/mobile from the
next commit.

* Add `lib/mobile/verify/enroll` compiled with gomobile

* `lib/mobile`: Temporarily use private Device Trust service

The public gRPC service exists on the demo branch but not on this
branch. In order to make it possible to compile
`lib/mobile/verify/enroll`, temporarily use the private service which
has similar RPCs.

* Run `make go-mod-tidy-all`

* Make Swift app connect to public DT service on "Request Now" tap

* mobile: Add sheet for enroll request status

* Revert go.mod changes

This reverts commit b9af7a7614 and
2c00ecd7fa.

* Add `build.assets/tools/gomobile`

* Move gomobile back to main go.mod

This reverts commits 9b2a6c4ea3 and
a83c2959fa.

go.mod

@@ -247,16 +247,16 @@ require (
 	go.uber.org/goleak v1.3.0
 	golang.org/x/crypto v0.53.0
 	golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f
-	golang.org/x/image v0.41.0
-	golang.org/x/mod v0.36.0
-	golang.org/x/net v0.55.0
+	golang.org/x/image v0.42.0
+	golang.org/x/mod v0.37.0
+	golang.org/x/net v0.56.0
 	golang.org/x/oauth2 v0.36.0
 	golang.org/x/sync v0.21.0
 	golang.org/x/sys v0.46.0
 	golang.org/x/term v0.44.0
 	golang.org/x/text v0.38.0
 	golang.org/x/time v0.15.0
-	golang.org/x/tools v0.45.0
+	golang.org/x/tools v0.46.0
 	golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173
 	golang.zx2c4.com/wireguard/windows v0.5.3
 	google.golang.org/api v0.272.0
@@ -598,7 +598,8 @@ require (
 	go.uber.org/zap v1.27.1 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/telemetry v0.0.0-20260508192327-42602be52be6 // indirect
+	golang.org/x/mobile v0.0.0-20260611195102-4dd8f1dbf5d2 // indirect
+	golang.org/x/telemetry v0.0.0-20260610154732-fb80ec83bdd9 // indirect
 	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
 	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect
@@ -642,3 +643,5 @@ replace (
 	github.com/redis/go-redis/v9 => github.com/gravitational/redis/v9 v9.6.1-teleport.1
 	github.com/vulcand/predicate => github.com/gravitational/predicate v1.4.0
 )
+
+tool golang.org/x/mobile/cmd/gomobile