fix(kuma-cp): check if kuma annotation or label is set but ignore value

[lukidzi]

Summery

Removed check if the value of annotation kuma.io/sidecar-injection is enabled, now we check if the annotation is present.

• Link to docs PR or issue -- docs docs(*): added information about NetworkAttachment and Kuma CNI kuma-website#940
• Link to UI issue or PR -- none
• Is the [issue worked on linked][1]? -- fix With CNI, the network-attachment-definition is only created when the kuma annotations are on the namespace #4224
• Unit Tests --
• E2E Tests -- none
• Manual Universal Tests -- none
• Manual Kubernetes Tests -- none
• Do you need to update UPGRADE.md? -- none
• Does it need to be backported according to the backporting policy? -- none

[jakubdyszkiewicz]

Should we document this somehow? https://kuma.io/docs/1.7.x/networking/cni/#kuma-cni

[lukidzi]

Should we document this somehow? https://kuma.io/docs/1.7.x/networking/cni/#kuma-cni

I'll add a note about this

Edit:
added kumahq/kuma-website#940