Clear CHANGELOG_PENDING.md post v3.31.0 release
### Improvements
-- [auto/*] Add `--save-plan` and `--plan` options to automation API.
- [#9391](https://github.com/pulumi/pulumi/pull/9391)
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-- [cli] "down" is now treated as an alias of "destroy".
- [#9458](https://github.com/pulumi/pulumi/pull/9458)
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-- [go] Add `Composite` resource option allowing several options to be encapsulated into a "single" option.
- [#9459](https://github.com/pulumi/pulumi/pull/9459)
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-- [codegen] - Support all [Asset and Archive](https://www.pulumi.com/docs/intro/concepts/assets-archives/) types.
- [#9463](https://github.com/pulumi/pulumi/pull/9463)
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-- [cli] Display JSON/YAML property values as objects for creates, sames, and deletes.
- [#9484](https://github.com/pulumi/pulumi/pull/9484)
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### Bug Fixes
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-- [codegen/go] - Ensure that plain properties are plain.
- [#9430](https://github.com/pulumi/pulumi/pull/9430)
- [#9488](https://github.com/pulumi/pulumi/pull/9488)
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-- [cli] Fixed some context leaks where shutdown code wasn't correctly called.
- [#9438](https://github.com/pulumi/pulumi/pull/9438)
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-- [cli] Do not render array diffs for unchanged elements without recorded values.
- [#9448](https://github.com/pulumi/pulumi/pull/9448)
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-- [auto/go] Fixed the exit code reported by `runPulumiCommandSync` to be zero if the command runs successfully. Previously it returned -2 which could lead to confusing messages if the exit code was used for other errors, such as in `Stack.Preview`.
- [#9443](https://github.com/pulumi/pulumi/pull/9443)
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-- [auto/go] Fixed a race condition that could cause `Preview` to fail with "failed to get preview summary".
- [#9467](https://github.com/pulumi/pulumi/pull/9467)
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-- [backend/filestate] - Fix a bug creating `stack.json.bak` files.
- [#9476](https://github.com/pulumi/pulumi/pull/9476)
