fix(select): sanitize user input before searching options

[psamim]

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Please check that your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
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PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Enhancement
[ ] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Infrastructure changes
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Issue Number:
#11854

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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[psamim]

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[Splaktar]

Thank you for making your first PR to AngularJS Material! 💛

As mentioned below, I'd like to avoid adding duplicate code. So I'd like to add this capability to $mdUtil and then both components that need it can make use of the same function.

• Please add a blank line and then "Fixes #11854" to your commit message. It's best to amend your commit and force push your branch after your updates are completed.
• Please add a basic unit test for this. It should throw the same error prior to this fix and then work as expected with this fix in place.

[psamim]

@Splaktar I applied the requested changes. Thanks for the review.

[Splaktar]

Thank you for making the requested updates. LGTM other than it needing to be rebased.

[Splaktar]

✅ Rebased.

[mmalerba]

LGTM