Allow for custom Temporary IAM Instance Prefixes

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#### Description

At the moment, when generating temporary IAM instance resources (keypairs, security groups, roles, profiles etc.), the name of the generated resources is always prefixed with `packer` followed by a `-` or `_` then a UUID. It would be useful to either:

A. Provide a complete custom name for each resource. Since these are temporary and should be cleaned up after execution, there should not be concern about naming collision. However, if this could be a some sort of security risk then:
B. Provide a custom prefix for each resource.

#### Use Case(s)

Providing IAM permissions to a subset of resources each containing a given prefix.

#### Potential configuration
Could be called something like `TemporaryIamInstanceConfig` or `TemporaryIamInstancePrefix` if the prefix must be consisent for all temporary resources.
```go
type StepIamInstanceProfile struct {
PollingConfig *AWSPollingConfig
IamInstanceProfile string
SkipProfileValidation bool
TemporaryIamInstancePrefix string
TemporaryIamInstanceProfilePolicyDocument *PolicyDocument
createdInstanceProfileName string
createdRoleName string
createdPolicyName string
roleIsAttached bool
Tags map[string]string
Ctx interpolate.Context
}
...
if s.TemporaryIamInstanceProfilePolicyDocument != nil {
// Create the profile
iamInstancePrefix := "packer"
if s.TemporaryIamInstancePrefix != nil {
iamInstancePrefix = *s.TemporaryIamInstancePrefix
}
profileName := fmt.Sprintf("%s-%s", iamInstancePrefix, uuid.TimeOrderedUUID())
```

#### Potential References
https://github.com/hashicorp/packer-plugin-amazon/blob/main/builder/common/step_iam_instance_profile.go#L60