bug(TOOLTIP): Tooltip displays immediately on touch - desktop only

#### Reproduction

Steps to reproduce:
1. Visit [Tooltip docs](https://material.angular.io/components/tooltip/overview) on a touchscreen laptop with a pointer input (mouse/touchpad)
2. Touch the first example button


#### Expected Behavior

From [the tooltip spec](https://material.io/components/tooltips#behavior):

> A tooltip is displayed upon tapping **and holding** a screen element or component (on mobile) or hovering over it (desktop). Continuously display the tooltip **as long as the user long-presses** or hovers over the element.

#### Actual Behavior

The tip appears immediately and remains there until you touch somewhere else or move the mouse/touchpad, if you have one.

#### Notes

I think this is a classic "sticky hover" situation, which has been an issue for [a really long time](https://stackoverflow.com/questions/17233804/how-to-prevent-sticky-hover-effects-for-buttons-on-touch-devices). I don't have a particular solution in mind, but I don't think we can ignore this because it conflicts with autocomplete.

I'm getting an error trying to open the Autocomplete examples in Stackblitz to set up a repro, but it's probably a transient thing (passed through some kind of Cloudflare error message) so if it's working for you, just edit any of the examples and add a tooltip. When you touch the input, both the tooltip and the dropdown appear at the same time. At least the tooltip is behind the dropdown.

As an aside, I just noticed that on mobile, the autocomplete dropdown opens on long-press. I don't think Autocomplete has a spec but this seems wrong to me -- I would expect it to open on tap instead, with a tooltip displayed on long-press, and I guess a context menu otherwise?

#### Environment

- Angular: all versions I tested, back to v8
- CDK/Material: same
- Browser(s): Latest Chrome, Firefox, Edgium.
- Operating System (e.g. Windows, macOS, Ubuntu): Win10

Start with the Tooltip docs example and reproduce the issue on a touchscreen laptop with a pointer input using the listed browsers. Compare touch behavior with the tooltip specification, then verify the autocomplete interaction described in the report. Done means the tooltip waits for a long press on touch, remains available while the gesture continues, and does not conflict with the autocomplete dropdown.

Written by the indexing model from the issue text.