Since there is no `revision` property in POM, we cannot use `sed` command to extract project version from the POM.

* Use more Maven-friendly `mvn help:evaluate -Dexpression="project.version" -q -DforceStdout` command to get the current project version
* Remove tentative `finish_release_tmp.yml` since `actions\build` has been fixed now

Fixes: #480

* Add `flatten-maven-plugin` to resolve properties
and remove unnecessary build info from the final POM of the artifact to install/deploy

* Revert `version` extraction from POM via `sed` command in the build action
* Remove `flatten.clean` from the Maven Flatter Plugin, since `.flattened-pom.xml` generated file is landed in the `/target` dir
* Add `pomElements/profiles` for removal in the result `.flattened-pom.xml`

* Remove unused imports

Signed-off-by: Tran Ngoc Nhan <ngocnhan.tran1996@gmail.com>

Fixes: #488

When `@Retryable(exceptionExpression)` is used with SpEL template (`#{..}`),
a specific warning is emitted into logs indicating that such a syntax is deprecated.

* Improve that warning message pointing out what SpEL expression could be improved to
avoid this warning and future changes

Closes gh-489

* Add tests for `RetryOperationsInterceptor` proxy attribute cleanup
* Add author to `RetryOperationsInterceptorTests`
* Remove unused import fail
* Fix `RetryOperationsInterceptorTests` extract `MethodInvocation` and simplify mocking

Signed-off-by: Kim Jun Hyeong <ggprgrkjh@naver.com>

Fixes: #491

The Micrometer tag cannot be with `null` value.
When `RetryCallback` does not provide a proper `getLabel()` implementation,
the `MetricsRetryListener` fails with a `NullPointerException`

* Fix `MetricsRetryListener.close()` to fallback to the `callback.getClass().getName()`
if `callback.getLabel() == null`
* Cover behavior in the new `RetryMetricsTests.labelFallbackToClassName()`

- Add warning logs when setter values don't meet expected constraints
- Maintain backward compatibility by not changing behavior

Fixes #352

Signed-off-by: Kim Sumin <ksoomin25@gmail.com>