Add Google Analytics, Dotfile, Segment and Square access-review connectors

Two OAuth2 and two API-key connectors:

- Google Analytics (GA4): OAuth2 with both analytics.readonly and
  analytics.manage.users.readonly (readonly alone 403s on the accounts
  list); v1alpha accessBindings enumerated at account and property level
  and merged by email; manual account picker (Pattern 1) with a
  per-connection probe and name resolver; distinct from Google Workspace.
- Dotfile: API key in the X-DOTFILE-API-KEY header (Pattern 3); GET
  /v1/users (owner/admin, suspended_at) with a static probe.
- Segment (Twilio): Public API token as Bearer with a required Region
  setting (US or EU) mapped to the regional host; GET /users plus per-user
  GET /users/{id} for roles and /invites for pending members; per-connection
  BuildProbeURL.
- Square: OAuth2 (EMPLOYEES_READ) or a personal access token (Pattern 3);
  POST /v2/team-members/search returns email/status/is_owner directly, so no
  role resolution; custom probe and name resolver.

Google Analytics and Square are confidential OAuth clients, wired into the
bootstrap OAuth provider list and .env.example. Segment carries a required
extra setting, so the console add-source dialog maps region onto its
segmentRegion API-key input; without that mapping the value is silently
dropped and the create is rejected.

Cassette-backed driver tests plus unit tests for the Segment probe URL and
the bootstrap OAuth provider list.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/accessreview/drivers/google_analytics_test.go

@@ -0,0 +1,59 @@
+// Copyright (c) 2026 Probo Inc <hello@probo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package drivers
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGoogleAnalyticsDriver(t *testing.T) {
+	t.Parallel()
+
+	rec := newRecorder(t, "testdata/google_analytics", "GOOGLE_ANALYTICS_TOKEN")
+	client := newVCRClient(rec, bearerAuth(os.Getenv("GOOGLE_ANALYTICS_TOKEN")))
+
+	driver := NewGoogleAnalyticsDriver(client, "123456")
+	records, err := driver.ListAccounts(context.Background())
+	require.NoError(t, err)
+	require.Len(t, records, 3)
+
+	// alice holds an account-level admin binding AND a property-level viewer
+	// binding: roles are merged, deduplicated, sorted, prefix-stripped, and the
+	// admin role sets IsAdmin. GA4 has no active signal → Active is nil.
+	alice := records[0]
+	assert.Equal(t, "alice@example.com", alice.Email)
+	assert.Equal(t, "alice@example.com", alice.ExternalID)
+	assert.Equal(t, "alice@example.com", alice.FullName)
+	assert.True(t, alice.IsAdmin)
+	assert.Equal(t, []string{"admin", "viewer"}, alice.Roles)
+	assert.Nil(t, alice.Active)
+
+	// bob: account-level analyst only.
+	bob := records[1]
+	assert.Equal(t, "bob@example.com", bob.Email)
+	assert.False(t, bob.IsAdmin)
+	assert.Equal(t, []string{"analyst"}, bob.Roles)
+
+	// carol: property-level analyst only (never appears at account level).
+	carol := records[2]
+	assert.Equal(t, "carol@example.com", carol.Email)
+	assert.False(t, carol.IsAdmin)
+	assert.Equal(t, []string{"analyst"}, carol.Roles)
+}