config: error configure_plugins_type on invalid properties

[stoksc]

After this change, when a plugin configuration contains an invalid property, configure_plugins_type returns an error which ultimately crashes fluentbit, instead of only printing an error log and continuing on. The change also fixes a small issue where name was printed by flb_error after it was freed. To properly test this change and get the test to pass with -DSANITIZE_ADDRESS=On on all platforms, I had to update configure_plugins_type to free objects that it fails to instantiate.

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Testing
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• [N/A] Example configuration file for the change
• [N/A] Debug log output from testing the change

Added tests, so the configuration files and outputs can be found there.

• [N/A] Attached Valgrind output that shows no leaks or memory corruption was found

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• [N/A] Run local packaging test showing all targets (including any new ones) build.
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Documentation

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Backporting

• Backport to latest stable release.

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