ci: Removed `use_new_release` input from prepare release workflow

[svetlanabrennan]

Description

We no longer need to use use_new_release input variable in the prepare release workflow since that will be the only option. Also added changelog_file input since it was missing.

Related Issues

Related to: https://github.com/newrelic/node-newrelic/pull/2124 Partially fixes: https://github.com/newrelic/node-newrelic/issues/2113

ToDo

• [x] Remove USE_NEW_RELEASE from github action variables

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.98%. Comparing base (9d716ba) to head (dc003ab).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #293 +/- ## ======================================= Coverage 98.98% 98.98% ======================================= Files 7 7 Lines 891 891 ======================================= Hits 882 882 Misses 9 9 ``` | [Flag](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | Coverage Δ | | |---|---|---| | [integration-tests-16.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `93.93% <ø> (?)` | | | [integration-tests-18.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `93.93% <ø> (ø)` | | | [integration-tests-20.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `93.93% <ø> (?)` | | | [unit-tests-16.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `59.70% <ø> (?)` | | | [unit-tests-18.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `59.70% <ø> (ø)` | | | [unit-tests-20.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `59.70% <ø> (?)` | | | [versioned-tests-16.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `95.84% <ø> (ø)` | | | [versioned-tests-18.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `95.84% <ø> (ø)` | | | [versioned-tests-20.x](https://app.codecov.io/gh/newrelic/newrelic-node-apollo-server-plugin/pull/293/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `95.84% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic#carryforward-flags-in-the-pull-request-comment) to find out more.

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