create node pool for tiflash and cdc

[DanielZhangQD]

What problem does this PR solve?

fix #2376

What is changed and how does it work?

Support creating node pools for tiflash and cdc

Check List

Tests

• Manual test (add detailed scripts or steps below)
  • Deploy EKS with the following config, node pools for tiflash and cdc are created successfully and tiflash Pods can be scheduled to the tiflash nodes.

  create_tiflash_node_pool = true
  create_cdc_node_pool = true
  cluster_tiflash_count = 2
  cluster_cdc_count = 2
  cluster_cdc_instance_type = "c5.large"
  cluster_tiflash_instance_type = "c5d.large"
  

  • Deploy EKS with the following config, node pools for tiflash and cdc will not be created.

  #create_tiflash_node_pool = true
  #create_cdc_node_pool = true
  cluster_tiflash_count = 2
  cluster_cdc_count = 2
  cluster_cdc_instance_type = "c5.large"
  cluster_tiflash_instance_type = "c5d.large"
  

Code changes

• Has Terraform scripts change

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Does this PR introduce a user-facing change?:

Support creating node pools for tiflash and cdc on EKS

[DanielZhangQD]

The new version of terraform binary will report a warning for the quotes.

[sre-bot]

cherry pick to release-1.1 in PR #2419