Some version are failing on upgrading process on testing upgrade jobs.

STR:
1. Install old PMM, for example, 2.38.0
2. Enable experimental repository

3. Open Home dashboard and start upgrade to 2.40.0

Actual result:  User is logout during PMM upgrade, "PMM has been upgraded" message doesn't appear.

 Expected result: User should see the message about successful upgrade and shouldn't be log outed during upgrade.

For example the following upgrade(UI way) matrix job: https://pmm.cd.percona.com/job/pmm2-upgrade-tests-matrix/1520/

Please investigate attached logs for the linked upgrade jobs which failed on upgrade process:

• (2.11.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30538/

• (2.12.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30539/

• (2.13.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30540/

• (2.19.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30541/

• (2.21.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30543/

• (2.22.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30544/

• (2.23.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30545/

• (2.24.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30546/

• (2.27.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30549/

• (2.28.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30550/

• (2.29.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30551/

• (2.29.1 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30552/

• (2.30.0 to 2.40.0) https://pmm.cd.percona.com/job/pmm2-upgrade-tests/30553/