Fix automatically generated release notes too long problem

[ljkiraly]

Expected Behavior

The automatically generated release notes should be truncated or short release note should be used instead. The release should not fail due to this github issue.

Current Behavior

The release command fails when a too long release note is generated during the release of 'deployment-k8s' and 'cmd-forwarder-vpp' repositories. Other repositories should be impacted later.

Failure Information

Check Release job#2341

  gh release create v1.14.2-rc.4 --title v1.14.2-rc.4 --target release/v1.14.2-rc.4 --generate-notes
  shell: /usr/bin/bash -e {0}
  env:
    GH_TOKEN: ***
HTTP 422: Validation Failed (https://api.github.com/repos/networkservicemesh/cmd-forwarder-vpp/releases)
body is too long (maximum is 125000 characters)
Error: Process completed with exit code 1.

A possible solution should be to trim the generated notes as described in the solution of this issue: https://github.com/orgs/community/discussions/63414

_{Huly®: NETWO-20956}