EmailOperator: fix wrong assignment of from_email

[vanducng]

• The EmailOperator call the smtp_hook.send_email_smtp function with mis-ordered of prams which caused unexpected email subject & content.

Hook function: (subject -> html_content -> from_email)

Operator execution call: (from_email -> subject -> html_content)

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[boring-cyborg]

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[vanducng]

@hussein-awala @eladkal I saw this provider was initiated/reviewed in last 3 weeks by you two, kindly help review the fix. Thanks.

[hussein-awala]

It seems that we need more unit tests on this operator, I'll add them in a separate PR. LGTM

[ephraimbuddy]

Let's make the send_email_smtp take only keyword arguments to avoid this mistake with any other operator

[potiuk]

Let's make the send_email_smtp take only keyword arguments to avoid this mistake with any other operator

Agree.

[vanducng]

Let's make the send_email_smtp take only keyword arguments to avoid this mistake with any other operator

Can you help to review again?

[eladkal]

tests are failing :(

[boring-cyborg]

Awesome work, congrats on your first merged pull request!