[HAProxy] Add timezone offset support

[P1llus]

What does this PR do?

HAproxy mostly does not log with a timezone by default, and we hardcode add_local after any custom processors, so its not possible to override the local timezone.

The PR adds the common timezone offset which we use in other integration + changes the order of add_locale to be before custom processors.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[elasticmachine]

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• Start Time: 2023-06-30T15:00:14.139+0000

• Duration: 17 min 45 sec

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[ishleenk17]

@P1llus : I see this is a timezone input configuration which we take from users in multiple Integrations.
We recently used this in apache_tomcat Integration where the same issue was there, Logging happened without timezone.

I suppose we can make it as a default configuration input for Integrations having logs without timezone.
If nothing is specified in this configuration option, local timezone is taken else the offset entered is considered.

[P1llus]

@ishleenk17 that is correct. I left the default value in the manifest.yml empty, because add_locale already existed, to prevent any changing behavior for existing users.

[ishleenk17]

A nit in the description, else looks good!

[elasticmachine]

Package haproxy - 1.7.0 containing this change is available at https://epr.elastic.co/search?package=haproxy