Audit all text entry fields and apply special character validation from 102649

[michaelclement]

Per this thread in DSVA Slack, we need to improve the text input validation to prevent users from entering characters that break the backend processing.

The validators made in #102649 and #34475 could be moved into the shared utilities directory and applied to all relevant text fields in FMP1, FMP2, OHI, and CHAMPVA Claims.

As a recap:
this set of "illegal characters" should be checked for and prevented if a user tries to enter them in normal text fields (e.g., not email fields or other special cases):

~!@#$%^&*+=[\]{}()<>;:"`\\/_|

Here is a log sample that demonstrates what happens when a user types an illegal character (such as ") in a vulnerable text-entry field. It should be noted that this issue is rarely seen.

Acceptance criteria

• All FMP1 text entry fields that do not already enforce a character validator are checked to verify that they do not permit characters that fall inside the regex shown above
• Repeated for FMP2
• Repeated for OHI
• Repeated for CHAMPVA Claims
• Any text fields found to permit the illegal characters specified above are updated to prevent the illegal characters from being accepted