feature(ui): update to ember 5.7 and latest dependencies

[raulb]

Description

Packages that were ready to update:

Before

 @ember/optional-features       ^2.0.0  →    ^2.1.0
 @ember/test-helpers            ^2.9.3  →    ^3.3.0
 autoprefixer                 ^10.4.12  →  ^10.4.19
 ember-auto-import              ^2.6.3  →    ^2.7.2
 ember-basic-dropdown           ^7.2.1  →    ^8.0.4
 ember-changeset               ^3.15.0  →    ^4.1.2
 ember-changeset-validations   ^3.16.0  →    ^4.1.1
 ember-cli                      ~4.8.0  →    ~5.7.0
 ember-cli-babel              ^7.26.11  →    ^8.2.0
 ember-cli-flash                ^4.0.0  →    ^5.1.0
 ember-cli-htmlbars             ^6.2.0  →    ^6.3.0
 ember-data                     ~4.9.1  →    ~5.3.3
 ember-page-title               ^7.0.0  →    ^8.2.3
 ember-qunit                    ^6.2.0  →    ^8.0.2
 ember-resolver                 ^9.0.1  →   ^11.0.1
 ember-sortable                 ^5.0.0  →    ^5.0.1
 ember-source                   ~4.8.0  →    ~5.7.0
 ember-template-lint            ^5.7.3  →    ^6.0.0
 ember-truth-helpers            ^3.1.1  →    ^4.0.3
 eslint                        ^7.32.0  →    ^9.0.0
 eslint-config-prettier         ^8.8.0  →    ^9.1.0
 eslint-plugin-ember           ^11.4.6  →   ^12.0.2
 eslint-plugin-prettier         ^4.2.1  →    ^5.1.3
 eslint-plugin-qunit            ^7.3.4  →    ^8.1.1
 postcss-import                ^15.1.0  →   ^16.1.0
 prettier                       ^2.7.1  →    ^3.2.5
 pretty-print-json              ^1.4.1  →    ^3.0.0
 qunit                         ^2.19.4  →   ^2.20.1
 qunit-dom                      ^2.0.0  →    ^3.1.1
 tailwindcss                    ^3.3.1  →    ^3.4.3
 webpack                       ^5.89.0  →   ^5.91.0

After (remaining upgrades)

 ember-basic-dropdown   ^7.3.0  →  ^8.0.4
 ember-data            ~4.12.7  →  ~5.3.3
 ember-template-lint   ^5.13.0  →  ^6.0.0
 eslint                ^8.57.0  →  ^9.0.0

It should fix https://github.com/ConduitIO/conduit/security/dependabot/101.

Eventually

We should tackle remaining dependency updates (especially ember-data), and fix those issues raised by this (currently ignored) rule which has to be with concurrency:

https://github.com/ConduitIO/conduit/pull/1483/files#diff-67374ffae5708e2151619b05053062ca3cac9a8071b22c51d828e6dc7e3d880eR31-R32

Quick checks:

• I have followed the Code Guidelines.
• There is no other pull request for the same update/change.
• I have updated unit tests.
• I have made sure that the PR is of reasonable size and can be easily reviewed.