Improve test coverage of tencentsms.py

[liuxingjun]

Description

Checklist

• I have reviewed the contributing guidelines.
• I have included unit tests for my changes or additions.
• I have successfully run make test-docker with my changes.
• I have manually tested all relevant modes of the change in this PR.
• I have updated the documentation.
• I have updated the changelog.

Questions or Comments

[nsano-rururu]

error

./alerters/tencentsms_test.py:1:1: F401 'json' imported but unused
./alerters/tencentsms_test.py:242:1: F811 redefinition of unused 'test_tencentsms_alert_secret_id_error' from line 216

[nsano-rururu]

changelog.

[nsano-rururu]

• Do not change ## Other changes to ## Other.
• Please describe at the top of Other changes.

[nsano-rururu]

- [Tests] Improve test coverage of tencentsms.py - [#479](https://github.com/jertel/elastalert2/pull/479) - @liuxingjun
- [Rule Test] Fix issue related to --start/--end/--days params - [#424](https://github.com/jertel/elastalert2/pull/424), [#433](https://github.com/jertel/elastalert2/pull/433) - @thican
- Changed the wording of ElastAlert to ElastAlert 2 and Update FAQ -[#446](https://github.com/jertel/elastalert2/pull/446) - @nsano-rururu
- Add missing show_ssl_warn and silence_qk_value params to docs - [#469](https://github.com/jertel/elastalert2/pull/469) - @jertel
- [OpsGenie] Clarify documentation for URL endpoint to use in European region - [#475](https://github.com/jertel/elastalert2/pull/475) - @nsano-rururu
- [Docs] The documentation has been updated as the name of Amazon Elasticsearch Service has changed to Amazon OpenSearch Service. - [#478](https://github.com/jertel/elastalert2/pull/478) - @nsano-rururu

to

- [Rule Test] Fix issue related to --start/--end/--days params - [#424](https://github.com/jertel/elastalert2/pull/424), [#433](https://github.com/jertel/elastalert2/pull/433) - @thican
- Changed the wording of ElastAlert to ElastAlert 2 and Update FAQ -[#446](https://github.com/jertel/elastalert2/pull/446) - @nsano-rururu
- Add missing show_ssl_warn and silence_qk_value params to docs - [#469](https://github.com/jertel/elastalert2/pull/469) - @jertel
- [OpsGenie] Clarify documentation for URL endpoint to use in European region - [#475](https://github.com/jertel/elastalert2/pull/475) - @nsano-rururu
- [Docs] The documentation has been updated as the name of Amazon Elasticsearch Service has changed to Amazon OpenSearch Service. - [#478](https://github.com/jertel/elastalert2/pull/478) - @nsano-rururu
- [Tests] Improve test coverage of tencentsms.py - [#479](https://github.com/jertel/elastalert2/pull/479) - @liuxingjun

[nsano-rururu]

@jertel

Is there anything else you care about?

[jertel]

Looks good to me. Thank you!