feat(codepipeline-actions): native Amazon EC2 deployment support (#33604)

### Issue # (if applicable)

Closes #33584.

### Reason for this change

AWS CodePipeline introduces a new action to deploy to Amazon Elastic Compute Cloud (EC2).
https://aws.amazon.com/about-aws/whats-new/2025/02/aws-codepipeline-native-ec2-deployment-support/

### Description of changes

Added the `Ec2DeployAction` action class and corresponding helpers.
- `Ec2InstanceType` - specify instance type: EC2 or SSM_MANAGED_NODE
- `Ec2DeploySpecification` - choose deploy specification: inline or DeploySpec (not yet included)
- `Ec2MaxInstances` - specify maxBatch and maxError configuration

#### Usage
```ts
new cpactions.Ec2DeployAction({
  actionName: 'EC2',
  input: buildOutput,
  // specify instance type
  instanceType: cpactions.Ec2InstanceType.EC2,  // REQUIRED
  // specify tag key and value, not ec2.IInstance
  instanceTagKey: 'Target',                     // REQUIRED
  instanceTagValue: 'DeployTarget',
  // deploy specifications
  deploySpecifications: cpactions.Ec2DeploySpecifications.inline({
    targetDirectory: '/home/ec2-user/deploy',   // REQUIRED
    preScript: 'hooks/pre-script',
    postScript: 'hooks/post-script',            // REQUIRED
  }),
  // the action will detach and attach instances from/to target groups
  targetGroups: [myTargetGroup],
  // the number or percentage of instances that can deploy in parallel
  maxBatch: cpactions.Ec2MaxInstances.target(2),
  maxError: cpactions.Ec2MaxInstances.percent(50),
});
```

### Describe any new or updated permissions being added

`Ec2DeployAction` adds permissions based on CodePipeline documentation:
https://docs.aws.amazon.com/codepipeline/latest/userguide/action-reference-EC2Deploy.html#action-reference-EC2Deploy-permissions-action

For details of actions, resource, and condition keys, see the Service Authorization Reference: [EC2](https://docs.aws.amazon.com/service-authorization/latest/reference/list_amazonec2.html), [ELBv2](https://docs.aws.amazon.com/service-authorization/latest/reference/list_awselasticloadbalancingv2.html), [SSM](https://docs.aws.amazon.com/service-authorization/latest/reference/list_awssystemsmanager.html)

### Description of how you validated changes

Unit tests and an integ test.
The integ test also asserts pipeline execution.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: Tietew

packages/@aws-cdk-testing/framework-integ/test/aws-codepipeline-actions/test/ec2-deploy-artifacts/inline/index.html

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+deployed index

packages/@aws-cdk-testing/framework-integ/test/aws-codepipeline-actions/test/ec2-deploy-artifacts/inline/scripts/post-deploy.sh

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+#!/bin/bash
+true

packages/@aws-cdk-testing/framework-integ/test/aws-codepipeline-actions/test/ec2-deploy-artifacts/inline/scripts/pre-deploy.sh

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+#!/bin/bash
+true