bindinfo: fix the bind fields with quotes or slashes

[zimulala]

What problem does this PR solve?

Fix #11708

tidb>  CREATE TABLE t (a varchar(512) DEFAULT NULL, KEY idx (a));
Query OK, 0 rows affected (0.01 sec)

tidb> CREATE GLOBAL BINDING FOR  select * from t where a BETWEEN "a" and "b" USING select * from t use index(idx) where a BETWEEN "a" and "c";
ERROR 1105 (HY000): line 1 column 48 near "\"a\" and \"c\""

What is changed and how it works?

Remove the function of getEscapeCharacter .

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

[codecov]

Codecov Report

Merging #11671 into master will increase coverage by 0.9161%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##             master     #11671        +/-   ##
================================================
+ Coverage   81.4085%   82.3246%   +0.9161%     
================================================
  Files           429        428         -1     
  Lines         92650      96779      +4129     
================================================
+ Hits          75425      79673      +4248     
+ Misses        11827      11648       -179     
- Partials       5398       5458        +60

[alivxxx]

LGTM

[qw4990]

/run-all-tests

[qw4990]

@zimulala Please fix the CI problem~

[zimulala]

/run-integration-common-test
/run-unit-test

[zimulala]

PTAL @qw4990

[qw4990]

LGTM

[sre-bot]

/run-all-tests

[sre-bot]

@zimulala merge failed.

[qw4990]

/run-unit-test

[zz-jason]

/run-unit-test

[zz-jason]

Data race in the test is a known issue, will be fixed by #11639.

[sre-bot]

cherry pick to release-3.0 in PR #11726