[bitwarden] Add agentless deployment

[moxarth-rathod]

Proposed commit message

bitwarden: add agentless deployment

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

• Clone integrations repo.
• Install the elastic package locally.
• Start the elastic stack using the elastic package.
• Move to integrations/packages/bitwarden directory.
• Run the following command to run tests.

elastic-package test -v

Related issues

• Closes [bitwarden] Add Agentless Deployment Support #18533

[infra-vault-gh-plugin-prod]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

[github-actions]

Vale Linting Results

Summary: 2 suggestions found

💡 Suggestions (2)

File	Line	Rule	Message
packages/bitwarden/_dev/build/docs/README.md	16	Elastic.OxfordComma	Use the Oxford comma in 'Groups, Members and Policies.'.
packages/bitwarden/docs/README.md	16	Elastic.OxfordComma	Use the Oxford comma in 'Groups, Members and Policies.'.

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The Vale linter checks documentation changes against the Elastic Docs style guide.

To use Vale locally or report issues, refer to Elastic style guide for Vale.

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: b23bdfd

cc @moxarth-rathod

[elastic-vault-github-plugin-prod]

Package bitwarden - 1.19.0 containing this change is available at https://epr.elastic.co/package/bitwarden/1.19.0/