Update user creation database for data analysis

Currently, the database only have last_update column which does not tell when the user first requested/created the account.

CREATE TABLE users (
	id INTEGER NOT NULL,
	username TEXT,
	uid TEXT,
	gid TEXT,
	email TEXT,
	reason TEXT,
	fullname TEXT,
	create_account TEXT,
	git_commit TEXT,
	dir_verify TEXT,
	subscribe_mail_list TEXT,
	notify_user TEXT,
	sent TEXT,
	reported BOOLEAN,
	last_update DATETIME,
	queuename TEXT, count BIGINT,
	PRIMARY KEY (id),
	CHECK (reported IN (0, 1))
);

added Backlog label

changed the description

added Sprint 23-10 label and removed Backlog label

changed title from Add created column in user reg database to Update user creation database for data analysis

Propose upgrade plan:

1. Merge PR: https://github.com/uabrc/rabbitmq_agents/pull/145
2. Run command to add the column to the database:

DB_PATH=./user_reg.db
# Add created column 
$ sqlite3 $DB_PATH 'ALTER TABLE users ADD COLUMN created DATETIME;'

# Update the created column with 
$ sqlite3 $DB_PATH 'UPDATE users SET created = last_update;'

# Verify the column is created
$ sqlite3 $DB_PATH -header -column 'SELECT * FROM users LIMIT 1;'

unset DB_PATH

3. Update the agents with the latest change.