packages/salesforce: Fix processor syntax issue when adding new ones

[shmsr]

Proposed commit message

Remove indentation from processors to avoid syntax error when adding new processors. This changed is required so that when processors are added from the UI they are at the same level (indentation) as the already added processors i.e., making it syntactically correct when formatted. Only apex is affected, for other datasets, it is in expected form.

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.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

How to test this PR locally

Tested by adding - add_fields: { fields: { my_id: "12345" } } from the UI in processors.

[shmsr]

Confirmed from the Agent Policy that processor when added from UI works:

        processors:
          - add_fields:
              target: salesforce
              fields:
                instance_url: 'https://instance-url.salesforce.com'
          - add_fields:
              fields:
                my_id: '12345'

[elastic-vault-github-plugin-prod]

🚀 Benchmarks report

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[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 29d9da9148404461b088fde67c28455b83393df6

cc @shmsr

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[elastic-vault-github-plugin-prod]

Package salesforce - 1.0.1 containing this change is available at https://epr.elastic.co/package/salesforce/1.0.1/