[Functions] Updating Functions scripts to feature Flex Consumption plan and best practices

[ggailey777]

Description

Updating Functions scripts to feature Flex Consumption plan and best practices

Checklist

• Scripts in this pull request are written for the bash shell.
• This pull request was tested on at least one of the following platforms:
  • Linux
  • Azure Cloud Shell
  • macOS
  • Windows Subsystem for Linux
• The most recent test date and test method are recorded in the script file.
• Scripts do not contain passwords or other secret tokens that are not randomized.
• No deprecated commands or arguments are used. (Release notes)
• All Azure resource identifiers which must be universally unique are guaranteed to be so.
• Resource names use a random function to ensure scripts can be run multiple times in quick succession without error.
• All scripts can be run in their entirely without user input.

Testing information

CLI version:

az --version 2.82.0

Validation date and files:

Date: 2/28/26

• ./create-function-app-consumption/create-function-app-consumption.sh
• ./create-function-app-premium-plan/create-function-app-premium-plan.sh
• ./create-function-app-app-service-plan/create-function-app-app-service-plan.sh
• ./create-function-app-flex-consumption/create-function-app-flex-consumption.sh
• ./create-function-app-connect-to-storage/create-function-app-connect-to-storage-account.sh
• ./deploy-function-app-with-function-github-continuous/deploy-function-app-with-function-github-continuous.sh
• ./create-function-app-connect-to-cosmos-db/create-function-app-connect-to-cosmos-db.sh
• ./functions-cli-mount-files-storage-linux/functions-cli-mount-files-storage-linux.sh
• ./connect-azure-openai-resources/connect-azure-openai-resources.sh

Extensions required: