feat: (automated tests) check the state of containers after waiting loops (#309)

Description

To check that DLE or Postgres is available, a loop is used in code, with limited number of cycles (usually 300). After the last attempt, nobody checks if it was successful.

Check the state of containers after waiting loops and fail immediately, if there is still no success.

Related issue

#309 (closed)

Examples

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes

Closes #309 (closed)