This is an attempt to update to ApolloClient@3. Multiple packages have
been replaced by a single one. This will likely result in a red pipeline
because Caches are now immutable. But it should be a good starting point
to explore what goes wrong:

TODOs:
1. Check that caching works correctly
2. Check that startup graphql works correctly
3. Update documentation with correct links
4. Link against importing from `@apollo/client`, we should always import
from `@apollo/client/core` as we otherwise pull in React related
dependencies.

Map `@apollo/client` to `@apollo/client/core`

Fix vendor dll

Migrate remaining apollo-link uses

Fixed Introspection fragment matcher

Added merge policies

Fixed more fragment matchers

Fixed dataIdFromObject imports

Fixed gql imports

Fixed apollo-link imports

Remove change to upload link

Removed duplicated ids

Fixed MR widget type policies

Fixed structure
Fixed incidents app

Added id to alert management

Added ids to pipeline editor

Add a resolution for subscriptions-transport-ws

Note: This is needed because @apollo/client has a peer dependency and
some other dependency pulls in a newer version. Both are functionally
equivalent.
Replaced fragmentMatcher with possible types

Removed id from type Repository

Added a few basic type policies

Fixed unit tests to pass

Added typenames to unit tests to make them pass
Cleaned up data checks in components

Apollo 3 doesn't return data property with result on error; thus, we need to check on result hooks if data exists before doing any operations with it
Fixed stylelint errors

Add missing typename in spec

Removed check for data

Cleaning up changes

Removed some unnecessary changes like imports order
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Manually set error policy to 'none'

Removed unnecessary guards from result hook in queries
Revert "Manually set error policy to 'none'"

This reverts commit 657eac6727c563555dcbe8a3013801ae710b80db.
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Fixed stripTypenames to be used on widget

Fixed specs after review

Add comment about pendingApolloRequests

- https://gitlab.com/gitlab-org/gitlab/-/merge_requests/55062#note_838943715

Reverted subsriptions transport change