[cisco_ios] Add Dissect and Grok patterns for IPACCESSLOGP logs with Event Code Trimming

[mohitjha-elastic]

Proposed commit message

cisco_ios: add dissect and grok patterns for IPACCESSLOGP logs with event code trimming.

Added dissect and grok patterns to support multiple log formats for IPACCESSLOGP logs.
Trimmed whitespace around the event code field to ensure accurate parsing and normalization of log entries.
These changes enhance compatibility with varied log formats and improve field extraction reliability.

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 elastic package locally.
• Start elastic stack using elastic-package.
• Move to integrations/packages/cisco_ios directory.
• Run the following command to run tests.

elastic-package test -v

Related Issue

• Enhancement issue 22830

[elasticmachine]

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

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[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 027dfb7

cc @mohitjha-elastic

[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

[elasticmachine]

Pinging @elastic/sec-deployment-and-devices (Team:Security-Deployment and Devices)