Reword onboarding email to account for user expiry (#26)

This PR rewords the onboarding email to make it more appropriate when
used for updates upon user expiry. The emphasis is on that the access
was either granted or updated. Updated can mean that some services have
been removed.

This email should now be appropriate for access changes due to user
expiry (WATonomous/infra-config#3522).

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: ben-z

emails/onboarding.tsx

@@ -18,7 +18,7 @@ type WATcloudOnboardingEmailProps = z.infer<typeof WATcloudOnboardingEmailProps>
 export const WATcloudOnboardingEmail = (props: WATcloudOnboardingEmailProps) => {
     const { name, services } = WATcloudOnboardingEmailProps.parse(props);
 
-    const previewText = `Welcome to WATcloud! Your access has been updated.`;
+    const previewText = `Your WATcloud access has been granted/updated!`;
     const accessInstructions = (
         <ul style={{ fontSize: "14px", lineHeight: "24px" }}>
             {services?.map((service) => (
@@ -31,14 +31,12 @@ export const WATcloudOnboardingEmail = (props: WATcloudOnboardingEmailProps) =>
         <WATcloudEmail previewText={previewText}>
             <Text>Hi {name},</Text>
             <Text>
-                Welcome to WATcloud, WATonomous's compute cluster and infrastructure. We are excited to have you on board!
-            </Text>
-            <Text>
-                This email confirms that your access to WATcloud has been successfully updated.
+                Welcome to WATcloud, WATonomous's compute cluster and infrastructure.
+                You are receiving this email because you have been granted access to WATcloud, or your access has been updated.
             </Text>
             <Hr />
             <Section>
-                <Text>Here's a list of services that you have access to:</Text>
+                <Text>Here's a list of services that you now have access to:</Text>
                 {accessInstructions}
                 <Text>
                     Access instructions for each service can be found in the <Link href="https://cloud.watonomous.ca/docs/services" style={{ color: "#1e90ff", textDecoration: "none" }}>Services</Link> documentation.