fix(@astrojs/telemetry): add optional integrations field (#3614)

* fix: filter out falsy integration from telemetry

Falsy integrations are now ignored in `@astrojs/telemetry`

This error should no longer occur,
```ts
 error   Cannot read properties of null (reading 'name')
    at file:///workspaces/bundle/node_modules/.pnpm/@astrojs+telemetry@0.1.2/node_modules/@astrojs/telemetry/dist/events/session.js:53:117
    ...
```

* ci: add tests for optional integrations

* ci: add changeset

* fix(@astrojs/telemetry): count number of optional integrations in use

* ci: add test for counting the total number of optional integrations in use

* ci: update changeset

* chore: make the changes @tony-sull sugested

* revert(@astrojs/webapi): mod.d.ts -> a4c78b5: [ci] format

* ci: remove `@astrojs/webapi` patch change

* chore(@astrojs/telemetry): remove totalIntegrations payload field

* fix(@astrojs/telemetry): add optional integrations field

* ci: add changeset

1 files changed, 42 insertions, 0 deletions

diff --git a/packages/telemetry/test/session-event.test.js b/packages/telemetry/test/session-event.test.js
index 70705512f..07b214c30 100644
--- a/packages/telemetry/test/session-event.test.js
+++ b/packages/telemetry/test/session-event.test.js
@@ -411,6 +411,48 @@ describe('Session event', () => {
 		});
 	});
 
+	describe('config.integrations + optionalIntegrations', () => {
+		it('optional/conditional integrations', () => {
+			const config = {
+				srcDir: 1,
+				integrations: [
+					null,
+					undefined,
+					{ name: "example-integration" }
+				]
+			};
+			const [{ payload }] = events.eventCliSession(
+				{
+					cliCommand: 'dev',
+					astroVersion: '0.0.0',
+				},
+				config
+			);
+			expect(payload.config.integrations).deep.equal(["example-integration"]);
+			expect(payload.optionalIntegrations).to.equal(2);
+		}); 
+		
+		it('falsy integrations', () => {
+			const config = {
+				srcDir: 1,
+				integrations: [
+					null,
+					undefined,
+					false
+				]
+			};
+			const [{ payload }] = events.eventCliSession(
+				{
+					cliCommand: 'dev',
+					astroVersion: '0.0.0',
+				},
+				config
+			);
+			expect(payload.config.integrations.length).to.equal(0);
+			expect(payload.optionalIntegrations).to.equal(3);
+		});
+	});
+
 	describe('flags', () => {
 		it('includes cli flags in payload', () => {
 			const config = {};