fix: help docs to include iac ignores

[ipapast]

What does this PR do?

Updates the --help docs for iac to include the new flags:

• --policy-path
• --ignore-policy

Where should the reviewer start?

Build locally and run
snyk iac --help to see the iac section include the 2 flags above under OPTIONS

Any background context you want to provide?

The functionality for IaC ignores is released on version 1.677.0

Screenshots

 snyk-dev iac --help
NAME
       snyk-iac - Find security issues in your Infrastructure as Code files

SYNOPSIS
       snyk iac [COMMAND] [OPTIONS] PATH

DESCRIPTION
       Find security issues in your Infrastructure as Code files.

       For more information see IaC help page https://snyk.co/ucT6Q

COMMANDS
       test   Test for any known issue.

OPTIONS
       --detection-depth=DEPTH
              (only in test command)
              Indicate  the  maximum depth of sub-directories to search. DEPTH
              must be a number.

              Default: No Limit
              Example: --detection-depth=3
              Will limit search to provided directory (or current directory if
              no PATH provided) plus two levels of subdirectories.

       --severity-threshold=low|medium|high
              Only report vulnerabilities of provided level or higher.

       --ignore-policy
              Ignores  all set policies. The current policy in .snyk file, Org
              level ignores and the project policy on snyk.io.

       --json Prints results in JSON format.

       --json-file-output=OUTPUT_FILE_PATH
              (only in test command) Save test output in JSON format  directly
              to  the specified file, regardless of whether or not you use the
              --json option. This is especially useful if you want to  display
              the  human-readable  test output via stdout and at the same time
              save the JSON format output to a file.

       --org=ORG_NAME
              Specify the ORG_NAME to run Snyk commands tied to a specific or-
              ganization.  This  will  influence  private tests limits. If you
              have multiple organizations, you can set a default from the  CLI
              using:

              $ snyk config set org=ORG_NAME

              Setting  a default will ensure all newly tested projects will be
              tested under your default organization. If you need to  override
              the  default,  you can use the --org=ORG_NAME argument. Default:
              uses ORG_NAME that sets as  default  in  your  Account  settings
              https://app.snyk.io/account

       --policy-path=PATH_TO_POLICY_FILE`
              Manually pass a path to a snyk policy file.

       --sarif
              Return results in SARIF format.

       --sarif-file-output=OUTPUT_FILE_PATH
              (only in test command) Save test output in SARIF format directly
              to the OUTPUT_FILE_PATH file, regardless of whether or  not  you
              use the --sarif option. This is especially useful if you want to
              display the human-readable test output via  stdout  and  at  the
              same time save the SARIF format output to a file.

       --scan=TERRAFORM_PLAN_SCAN_MODE
              Dedicated flag for Terraform plan scanning modes.
              It  enables  to control whether the scan should analyse the full
              final state (e.g. planned-values), or the proposed changes  only
              (e.g. resource-changes).
              Default:  If  the  --scan flag is not provided it would scan the
              proposed changes only by default.
              Example #1: --scan=planned-values (full state scan) Example  #2:
              --scan=resource-changes (proposed changes scan)

[ghost]

Note sure what's going on with the spacing in help/commands-txt/snyk-iac.txt. Seems to be an existing issue so not blocking.