Change ResourceAccessLevel to match authorization policy given

[CelineTrammi]

Change ResourceAccessLevels from Send->Write and Open->Read. See is also removed.

Description

As mentionend in the related issue, the terms "Read" and "Write" are more commonly used across different platforms. To make it easier for the user, we are swithing the ResourceAccessLevels to align with these terms, that are also used for authentication policies.

Related Issue(s)

• Endre fra send/open til read/write for autorisasjon actions #316

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)
• All tests run green

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[Ceredron]

Looks great! I'll update the dagl-correspondence resource to include the write action.

[Ceredron]

This page needs to be updated: https://docs.altinn.studio/correspondence/getting-started/service-owner/